On the RLC Street used to be a club called "Snatch". Inside this club was a dance floor then above it a glass dance floor (modeled from the one I put in my property) forming two individual floors with stairs up to the 2nd floor. On the main stage was a large white screen that covered both floors. On the screen it played live footage of each floor so bottom was live on the top and top was live on the bottom. This showed the dancers live as it happened no matter which floor they were on. The Manager did this with a video camera I believe, from what he said. Camera sent live footage to a server and that live feed was fed to the screen as a prop.
Judging by that you would be limited to amount of rooms if you used this approach. Or spend a fortune on video cameras but still have the problem of every room not being in view, unless it gets triggered by people entering.
NOTE: My nick and image are from a company. That company allows people to use them both as long as they get permission and a licence. I have that and a certificate to prove it.
"These are not the Druids you are looking for..."