My question was around an IAP deployment. In that case we are tunking the vlans to the Air Monitors. Being plugged into different switches (buildings) with different vlans trunked to them should make it automagically know the location.....I hope.
For a controller though with all the vlans trunked to it, I'm not sure how it would deduce the location of the AppleTV.
Hopefully one of the Aruba guys can chime in with a suggestion.