Hanging a convex mirror on it can be transformed, but it will harm others and benefit themselves. It's not impossible.
You can also plant plants on both sides of your door to stop evil. Plants are recommended to be leafy and pointed.
The above two methods are beating and blocking. There is another way that is more obvious. Is to melt evil spirits.
If the toilet is in the east or southeast of your door, use fire to dissolve it. Putting a red object in front of the door represents fire, facing the toilet, which can melt evil.
However, it is suggested that the landlord should plant plants. Don't underestimate plants. Plants are beautiful and can block the suffocation. If you point the convex mirror at others, it will be bad to have an argument.