I thought I’d share my current wall tablet setup. I’m using a Lenovo Tab 4 10" Plus running LineageOS 16.0 (Pie 9.0) and HABPanel with the New Pride theme from @pmpkk. It’s currently always powered from a twin USB charger behind the wall recess, charger also supplies power to the Aeotec Multi-Senor 6 (above tablet).
I’m also running Fully Kiosk Browser with motion detection to turn the screen on after a 15 minute time out. The tablet also goes to sleep at night and wakes up in the moring on a 7 day schedule. The camera motion detection is not great, especially at night so I’ll look into doing something smart with the Multi-Sensor 6 and the Fully rest API, a task for another day though.
I’ve found HABPanel and Fully do have some lag but nothing I cannot live with. My tablet is mainly informational as I have rules which do most of the home automation and use voice for most other home control.
The tablet is mounted via magnets that are J-B welded to the tablet and wall recess. The magnets also serve as locators so the tablet ‘snaps’ in and is always level. It is currently the only tablet I have so I needed to be able to remove it very easily so I can play Minecraft with my daughters