I just had my house rewired and installed 2 20-amp outlets for my stereo wall. I used Monosaudio Audiophile Duplex Receptacle 20 Amp 125V Pure Copper Audio Wall Outlets bought on Amazon. These were wired with all 3 wires for each duplex outlet pulled back to the panel (no common ground). They’re reasonably priced and I got an almost noise free connection and my sound definitely improved ( and everything I have is connected to a Furman conditioner).
To warn everyone in the US, under the NEC code all new electrical outlets must be tamper resistant. You will be hit with this if you need an inspection for the work. Unfortunately I haven’t found an audiophile 20-amp outlets that’s tamper resistant if they’re round, only white square (decora).