Placement - ilikecake/ESP32-Wall-Display GitHub Wiki
Secure the back case to the wall using appropriate screws. I used #6 screws. The device is very light, so screwing directly into drywall is fine. I recommend using a level to make sure you install the case level with rest of the room.
With the back securely fastened to the wall, set the front case onto the back case and secure with four #2 PHMS.