It is best to hang it on the wall of the living room, so that the wall is located on one side of the main seat of the sofa.
Secondly, put it in the study or hang it on the wall with the seat back.
Sticking your back to the wall means trusting wealth with your back.
It should not be placed on the walls of master bedroom (husband and wife room), children's room, dining room, kitchen and walkway.