In ancient times, the East was not always expensive. Who was revered in the Eastern Han Dynasty? Dai Kun's Rat Pu: "China people respect rights. It is said that the demotion is to go left and the right is west. Therefore, it is more expensive in the Eastern Han Dynasty.
The so-called right of a mausoleum should be based on the mausoleum, not on the left and right of the viewer. For example, you are "a mausoleum", facing south, and the west is on your right.