This is an issue at my school district where I work as a network admin. Right now, I could see around the list of at least 15-20 Apple TVs that is located across school buildings when I press on AirPlay function on my iPhone 6. Our only security we have is right now that all Apple TVs require password to access before we can use them.
What is a good method to limit Apple TVs to only ones that teachers should be seeing in the list to select from? I am trying to find the answer for this on Internet but I cannot find one.