Building custom enclosure. What power supply is suitable?

Greetings

First off I want to say that I know little about power. My goal is to print a case for 4 of my Rock 5Bs and supply power from an internal power supply.

Can someone point me in the direction I should go. Ideally I want adequate power as if it were running at full utilization.

Thanks in advance.

There are entire threads here about powering Rock 5.

Formally speaking it should be powered by a USB-PD brick.

In practice some users have plugged DC barrel jack adapters to USB-C, giving the board fixed 12V on power pins, and the board runs fine without proper USB-PD negotiation, mostly because it’s MP8759 chip powering everything downstream with 5V and up to 8A of power. That’s 40W at full utilization but you’d be hard pressed to get there - like a utilisation of NVMe drive and all USB ports at their full at the same time. Power consumption barely reaches 12W during a stress-test: