For anyone that has, or is planning to, implement my compact approach to building a 5-tuner encoder setup:
I'm amending my USB hub recommendation. I've found the one in the original post to come up short power-wise on a full reboot. In fairness to the manufacturer, it does say that it can deliver 1.5A to each of any four ports, which can leave that 5th device trying to boot using standard USB3 max power (.9A). Sometimes it's fine, sometimes not.
So, I've migrated to this hub, which can deliver 1.5A per port when connected to a host computer or 2.4A per port when used exclusively for power. Used either way, it supplies enough power to simultaneously boot five streaming sticks. The other cool thing is that this hub is supported by uhubctl, which allows the power to each USB port to be managed individually:
https://www.amazon.com/dp/B096YKDYX5
uhubctl is great, but I wanted something a bit nicer than the command line, so I put together a Docker container that includes this utility -- plus adds an API. I'll be incorporating this into ah4c, so that you can do a power cycle of any of your USB hub connected streaming sticks from ah4c's WebUI: