Unplug all cables from the Apple TV before disassembly and flip the device over.
Using the widest plastic opening tool, force its sharp end into the seam between the Apple TV's bottom plate and its outer casing. Starting on the side with the ports, insert the tool so its tip is angled upward when leverage is applied.
Pry the bottom plate away from the case, starting with the edge closest to the bottom of the apple. Work your way around the plate until all clips are disconnected.
With the plastic clips free, lift the bottom plate.