What are the disadvantages of Mao tombstone leaning forward?

The tombstone leans forward into an arch, which will make future generations unlucky and lift their heads.

According to traditional geomantic omen:

The grave also has good luck and bad luck. Anything far away must have a stage. In fact, phase is "shape", just as a family has a family shape-family phase, or a person has a human shape-human phase, then a grave also has a tomb shape-tomb phase.

The quality of the tomb represents the rise and fall of a family.