I’m pretty sure that the ps5 will let you choose to keep usb power on or off or even have a few hours delay before it turns off. The ps4 was that way and I think even the ps3 was that way, too.
Should of put the fan closer to the middle cause I watched a video about exhaust flow for PS5 and Xbox series x and on your Xbox you got it perfect. But the PS5 the exhaust exit out the back at a downward angle in the middle part of the rear. I know it's sucks but look the video up. Just type in PS5 exhaust flow and you will see a guy with long black hair it's like a 30 min video or so he breaks it down and shows with mirrors and stuff it's really cool. Just thought you would like to know😅
