In our school environment, we have a WPA2 network with simple username/password for joining all our Apple TVs. Eventually we replaced this with hard-wired Ethernet connections. Faculty and staff join another WiFi network which students may not access. This network allows staff to see Apple TV in AirPlay while students may not.
The problem is we have incredible inconsistency with some users experiencing periodic disconnects while others are fairly consistent. We checked with a number of other schools experiencing the same problem, and we also checked with two outside networking companies to evaluate our network health. Health is good. Pinging many different end points, we see packet loss is unusual. We have come to the conclusion that the problem is in the Apple TV device, not our network.
I read that using Apple TVs in this way is in a sense creating a use case for the device as they were never intended to be used in such an environment. I want to find success stories where relatively large schools (1200+ staff and students) have deployed Apple TVs and used them without the problems we are having.
Some other things we did based on research:
Turn off sleep mode
Disable screen saver
Turn off Bluetooth
Upgrade to Generation 3 Apple TV
majority iPads are 3+ but there are some iPad2