Can the monument erected on the old grave move freely?

No, there is a special emphasis on erecting a monument in front of the tomb. Why should the erection and orientation of the monument be corrected by professionals? It is precisely because of lack that it can stand. In addition, in ancient times, the emperor could give tablets, and only those who had a good fortune were worthy of this honor and could afford it. Otherwise, erecting a monument at will will bring unnecessary trouble to the family.