In my case right where the psu is gonna be theres for like 4 slots for rubber feet, my case only came with one with it so i just took it off so it wouldn't be off balance.
You can buy stick-on rubber feet at any hardware or general household store, I've done that many times for cases which had no feet, or for cases whose feet weren't thick enough for my liking.
You can buy stick-on rubber feet at any hardware or general household store, I've done that many times for cases which had no feet, or for cases whose feet weren't thick enough for my liking.