Um, I would send you a picture, but it’s behind a bass trap and subwoofer!! :D
I’m suggesting a decent outlet with a 90 degree plug. The plug is the key. It keeps the cable flush to the wall until it hits the outlet.
I do suggest at least "Commercial/Residential" outlets ($5-$10) to replace old residential outlets. The commercial part adds higher quality and tighter contacts, the residential part of the label adds tamper resistance (TR) which is required in residential outlets. Of course, you are free to go nuts with even more expensive outlets. :)
I wrote about this here:
https://speakermakersjourney.blogspot.com/2022/01/audiophile-ac-outlets-for-frugal.html