I had a discussion with a former co-worker that is the Lead for A/V and smart class rooms at my former work. They looked at Apple TV to do just that and decided

I had a discussion with a former co-worker that is the Lead for A/V and smart class rooms at my former work. They looked at Apple TV to do just that and decided that there were to many security/room for mischief issues for Apple TV. I can't remember who, but they are evaluating a air-play device that offers more granular control. might not be as big of a deal in k-5 as it is in higher ed though.