Lock your room displays to the Rooms app so people cannot easily close it and open other apps. iPad and Android both have a "kiosk mode" for this. Turn on a device-level setting to stop people from easily closing a specific app.
Android tablets
Pinning locks a selected app to the display. It is available for tablets that run Android 5.0 and higher.
iPad
Guided Access mode limits your iPad to one app at a time.
Kindle Fire
Parental controls on the Kindle Fire restrict access to certain apps, including the Amazon app store. For more control, use 3rd-party apps.
Block automatic updates from iOS
Apple iOS updates can put a heavy load on an organization's networks and sometimes cause devices to go offline. To manage updates at the best time for you, see tips to block automatic iOS updates.