May I make an alternative suggestion? I have a Furman line stabilizer/conditioner and a hungry Pass X250.5 amp. I plug all my source and preamp components into my Furman, but my power hungry Pass straight into the outlet, with a good quality power cord (I happen to like Triode Wire Labs power cords). I’ve tried it both ways and letting my Pass drink from the wall with a decent cord is simply superior in terms of slam and dynamics. Experiment, but don’t be adverse to going with what sounds best if plugging into the wall gets you there.
Enjoy, and I’ll be interested in knowing what you find. With the 300s you can even play with one off the Furman and one straight into the wall.