This is very much a broad question as i don't know enough yet.
Is it feasible to get two or more aTV to sync together in terms of playback. So 3 of them and 3 screens with a left, right and centre movie playing?
I don't know how accurate the starting of playback can be, nor whether the internal clocks can be accurately synced together or whether it could even read external sync over a network for example.
If there are any resources, thoughts or articles of interest I'd really appreciate some pointers and how to start this deep dive?