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You can run multiple USB things off one power adapter, just make sure it's a decent one. You can run plenty off this for instance
https://smile.amazon.co.uk/Anker-Compact-10-Port-PowerPort-Charging-Black/dp/B00YSA0WI8/I have multiple, daisy-chained, unmanaged switches in my setup with no issues. For PoE stuff I have a 4 port switch with PoE which is enough for my needs.
For power I have one of these
https://excel-networking.com/catalogue/product/D13-12-EXLFor video over Ethernet that doesn't go through the network at all in my setup. There's a separate adapter at each end that plugs into HDMI.
aggi-
Good point on the Anker USB adapter, they are pretty much the only non OEM chargers I trust. Looking at the reviews there's some guy running 6 Raspberry Pi(e)s off them so that'll do nicely.
The video over ethernet option I was looking at before was HDMI over ethernet but I haven't done enough research and have no idea what I'm doing...
Fox
I am rapidly considering it more and more...
Oh yeah, I forgot my requirement for passive cooling due to the fact it will basically live in a bedroom cupboard :)
I'm only actually using one thing powered by PoE at the moment (Unifi access point). I do plan to add another in due course but it's the sheer number of mains sockets required otherwise!
Setup without PoE would eventually be:
I was planning on using two 6 gang surge-protected extension leads (one was never going to be enough) and I will have a 2 gang socket to plug these into, so I'll have 12 sockets. One spare and I've probably forgotten something!
The extension leads do have 2 USB sockets on each but only 2.1A across the two sockets, and I already know from personal experience the Tado bridge doesn't like not being plugged into it's mains USB adaptor and Raspberry Pis are apparently fussy about power too.
I could run the Pis off PoE though which with two UAPs running on PoE and a PoE splitter for the Tado bridge would save me 6 plug sockets, so I could lose a whole extension lead, have the option of running other stuff from PoE and have a spare plug on my 2 gang socket for future growth...