Use multiple apple tv

In each room of a 10 room-business hotel i want to install apple tv for the guests.

Only to use the plex app to watch tutorial movies that are available on a plex server pc inside the hotel (same network) (only movies via internal plex movie server, no external movies needed)

each guest must be able to select his own movie in his room, via the plex app on the apple tv.

Should i install each apple tv with or without apple id ? same apple id or each room different id or install and skip apple id ? Each use i want apple tv to ask for a code a strartup, so guest wont be able to connect to other rooms