You can add PoE (Power over Ethernet) to the Pi 4 or Pi 3B+ pretty cheaply (10-15 dollar hat), and avoid the USB power supply altogether. Not strictly necessary, but makes the wiring so much simpler/cleaner as just one single ethernet cable doing power and data, and you can expand into other neat PoE solutions. My Pi cluster is powered by my ethernet switch alone.
It makes wiring a UPS into the system really easy too - just have backup power on the ethernet switch, the downstream Pis are taken care of. I'd love if the Pi 5 just has PoE out of the box personally, I run all my Pi projects this way now.
I am unsure why you are telling me this. I am aware of the RPi PoE HATs, but the OP looks like he has a number of other USB powered devices beyond a single SBC, and it doesn't look like he has a PoE switch. For $30 or thereabouts he can replace all of the USB PSUs which will simplify the cabling and be a little more energy efficient.
It makes wiring a UPS into the system really easy too - just have backup power on the ethernet switch, the downstream Pis are taken care of. I'd love if the Pi 5 just has PoE out of the box personally, I run all my Pi projects this way now.