What should I pay attention to if I dare to block Taishan stone?

Let me answer your first question first. Taishan stone dares to block it. First, pay attention to the time, that is, the auspicious day. Second, divide the day, that is, that day. Then, the height, where to put it.

According to you, putting Taishan stone doesn't work. You have to put a magic mirror, that is, a concave-convex mirror, to work.