So it is weird, I cannot find any details online, but we just set up multiple AppleTVs in our office for meeting rooms today. They are hard wired to our network which is connected with our WiFi network. All access points and hardwired devices connect to the same network switch/router.
It seems that somehow devices know which AppleTV they are near, as only the nearby ones (within about 40-50 feet) show up as options in AirPlay. Does anyone know if this is a feature, or is it a problem that we need to troubleshoot? (Don't want to have a big client meeting and then scramble to get a something working to show work.)