Several companies on Amazon sell a hidden AppleTV mount. The mounts allows the AppleTV to be attached behind the screen to improve the aesthetics of your TV. The Apple remote control will continue to work as long as the front of the AppleTV faces up to take at reflected IR signals from the remote. Alternatively, you can make your own mount.
Option 1 – Cheesy but only 5 minutes
Tie the AppleTV to the vents. Use non-metallic ties and loop them carefully in the vents with the TV unplugged to avoid shock and damage. Clearly, this approach won’t hold up with any TV movement.
Option 2 – 10 minutes of 3d mental thought with pliers
Bend a coat hanger to create a study mount.
Use the non-metallic ties to attach to the TV.
Keep the remains for your next coat hanger project.
