To do this: You will need any adapter as long as it's square
1. Find a corner (make sure it's made of cement and is painted)
2. Slide the adapter upward with medium force.
3. Congrats.
(TRY THIS AT YOUR OWN RISK) It may leave some marks on the wall which are NOT REMOVABLE.
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https://www.youtube.com/watch?v=UNStYz4dbUc