I have to thank you for this link.
Although I’ve had the Acoustic Revive RR-777 for years it’d been left in place for pretty much all that time across the room from my system and off to one side. It was elevated about 6’3" on top of a bookcase holding my records. Read the reviews in Amazon from your link, even had the ones in Japanese translated, and one reviewer mentioned how for him the elevation was critical and that once he dropped it to about 1m 40cm the effect went from subtle to quite noticeable.
In my case I dropped the unit one shelf down from the original 6’3" to 5’. I don’t want to sound hyperbolic but the effect went from subtle to anything but that. The soundstage expanded farther into the living room and the images solidified.
Tweaks are often laughed at and that’s fine. I especially like those who base their derision on science and measurements. Maybe the measurements sometimes look at inconsequential factors because the science isn’t nearly as developed as we may think. Not trying to get into a pissing contest with any one, just trying to express an opinion. And I know what is said about opinions, everyone has one.
Again, thank you Elk.