No, just like the Bagua Mirror, no more than three can be used. Shanhai Town is divided into two types: indoor and outdoor, but no matter which one is placed, it faces outwards. I don’t know which one you bought, but the outdoor ones should be placed on both sides of the door. The ones indoors should be placed directly opposite the entrance (without affecting access) and facing outside. The indoor mountain and sea town should be placed facing the outside, just opposite the entrance, so that it does not affect the access of people. Remember not to face the door of other people's homes, otherwise the luck of other people's homes will be suppressed.