I bought a 20-story house, facing the roof, okay?

Geomantic speaking, the 20th floor is a good building, which can suppress the fortune of18th floor. But the house opposite is a roof, but it's not very good. The roof can be called the Temple of Heaven. No matter how high or low, any gas field can gather. If you can see the position of the opposite roof at the window, you can tear two pieces of small red paper by hand on both sides of the window. The width is as big as two fingers, and the length can be as long as fingers. Stick it symmetrically to a higher point. If you are a door, you can also stick two pieces of small red paper on both sides of the door by hand. How can you avoid evil spirits?