[symfony_]

We are running chromebits. Runs on ChromeOS, simple to build a 'kiosk app' which automatically starts on startup. Costs more than RPI.

Very easy to lock up, easily administered (reboot/screenshot) from the management console. We have a few hundreds of them out there, works like a charm and pretty much no work.

I'd advise against the likes of RPI's if you need a few and remote manage them. Deploying new app versions is very easy and the thing just works. Don't underestimate the freedom it gives to not have to do any damn thing on the box, ever. When working at scale the time you save is enormous.