Lol! It’s hard to tell from the angle but I don’t sit under it.
I have tried to make the most of a small room.
One advantage is it keeps the gear off the floor, and therefore from speaker-induced vibrations.
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I ordered two Airplate S9 fans, one for each side of the P20. Will let you know how it works and looks.
I also ordered a couple of S2 fans and one S10… this looks like a great company. I have an external power supply that gets quite hot to the touch, so I’ll put an S2 on top of it. Thank you @netspecht-2!
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Awesome! These guys coupled with the space above will be plenty for the P20 to breathe properly. The lack of space on the side doesn’t concern me at all. You may however need to hire a body builder to lift it up there though…
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Hi @jamesh, would 1.5” gap (10” total shelf height) above a P15 be too close for comfort in a quadraspire rack?
Lol! Yes, I got a 75 lbs. amp up there solo but I was 5 years younger!
I’m hoping I can tip the delivery person and he will help.
My wife would just ask what it is and what it cost… 
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1.5" + open on all 4 sides within the Quadraspire rack won’t be a problem. Even if the P15 is getting pretty toasty, convection will produce plenty of air to circulate above it.
Something kind of interesting, there is a little cobweb just above my BHK 250. When I’ve been listening to music for a while and the 250 is pretty warm, the web sways a little bit because of the warm air rising away from it. There are no vents or fans near my rack.
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I’m trying to imagine holding it in place while plugging everything in and then running the cables. Maybe a transmission jack…
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Yes, I have a great jack but it wouldn’t be great on the Italian couch…
There is actually about 6-8" of room at the back, so all the connections can be made once the unit is on the shelf, luckily.
Great, Many thanks James
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Convection cooling requires space to allow proper air currents to propagate. Although there’s no definitive specification, it is recommend a minimum of 5~6 inches of ventilation space on top and at least 2 inches on either side of the receiver/amplifier, and a cabinet that has both adequate airflow in and out to reduce the risk of the amplifier overheating. Otherwise you will need to assist the airflow. Care must be taken with this approach though, as some amplifier’s circuitry (biasing) can be adversely affected if designed for convection cooling, when placing a fan on or above directly forcing air into the unit. While I know this is not the desired response in relationship to the OP’s question, I would never place items that are convection cooled inside a cabinet that is closed on 3 or more sides.
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Are you are an engineer at PS Audio? We just had PS Audio confirm it’s not an issue. I trust the people that made the product.
Where are you getting your “recommended 5-6”? Certainly not from PS Audio. I have a real pet peeve with opinions that are attempted to be portrayed as facts.
FYI: the fans draw air out and therefore assist with convection cooling. Setting the fans to push air in is the wrong approach.
On another note, I started using my AC Infinity fans on a Denon 8500 AVR and a power supply and they certainly run cooler. These are great products. While probably not necessary, as @jamesh said, the fans will assist with convection and probably prolong the life of the units. I think they are worth considering regardless of your available air space.
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Whatever your pet peeve may be, it doesn’t presuppose error on my part. While I agree not everyone has the best of advice, let’s see what other manufacturers in the industry have to say if you want to discount my advice. You’re a Denon owner, right? Let’s see what they have to say about convection cooling.
Paul’s response when asked stated, “…these units are over-heatsunk meaning they have far more thermal mass than they require. They can’t be in a sealed box, obviously, but out in the open or with some ventilation they should be fine. There aren’t any set rules for distance, but a few inches should be sufficient.” When he was asked where does he place his, he stated that it was in the open on the floor, which I certainly agree with, not placing it inside an enclosure.
I’d put some footers under it so draws more air from bottom of fins to top like a chimney since sides are not exposed. Mine is wedged tight between my monoblocks with side cooling fins. I have similar continuous load draw. Yeah it gets s hot. I had to pull it a bit forward so my 1000 WPC monoblocks had more side cooling since they can run even hotter than P20.
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Which would be relevant if he was asking about a Denon receiver/amplifier. 
If PS Audio states it is OK, it is OK. If one wants to be more conservative this is fine also.
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My initial comment was concerning convection cooling. What you or someone else does with equipment is your or their choice. It still doesn’t take away from the truth about adequate cooling.
Right, I have rubber/cork footers that are about 1” high under most of my gear, including the P5 (and P20 coming next week) and the Denon 8500. This certainly improves convection cooling.
@Barsley asked about the Denon and convection cooling - the 8500 has 4 internal fans that push air up over the cooling fins and out the top. So Denon definitely believes in fan-assisted convection cooling! As far as I can tell, they have never turned on, despite the sides being only 1/2” away from the shelf.
I think we can put this matter to rest.
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You certainly have nailed that coffin shut.
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You two are comical! 
Have a great new year
I hope you find a good solution, because the P20 is magic, it’s really helped my system. Worth the effort.