The Ubiquiti UniFi range stilll support 1000BaseT with POE, but different models of AP need different voltages. As WWWombat points out the two lower models in the range need 24v POE and the AC-Pro & Edu need 48v. Ubiquiti manufacture 24v & 48v sourcing POE switches but are high port count, maybe too many for a residential solution.
There are lower port 802.3af & 802.3at switches out there though. I don't have a link but Google shows some.
As far as wireless channel selection Ubiquiti usually recommend to set fixed channel allocations per AP staggered by initial design. Not much point on an AP moving itself to another channel that may be used by it's neighbour.