Which emperor had the best feng shui burial in ancient times?

After the death of Gan Ling, Wu Zetian ordered Yuan Tiangang and Li, the famous magicians in the ruling and opposition parties at that time, to choose a site for the emperor. They traveled around Kyushu respectively, and when they came back, they all said that they chose this dry county, Liangshan. Wu Zetian sent envoys to inspect. At the top of Liangshan Mountain, Yuan Tiangang said that he buried a copper coin here, and Li said that he ordered an iron nail here. Digging the ground, Li's nail was just inserted in the copper square hole buried by Yuan, and everyone present applauded in surprise. So Wu Zetian chose the mausoleum site in Liangshan, which is now the dry mausoleum. Ganling was cut by the sword of the cold weapon era and shelled by the machine gun of the hot weapon era. 1200 years, as many as 17 people stole Ganling, of which the largest number reached 400,000 at a time, and Liangshan where Ganling was located was almost poached. However, today, Gan Ling still does not abandon or give up, and dutifully protects the remains of her master Wu Zetian and her husband Li Zhi like Xu Sanduo. We can't help asking, the mausoleum of Emperor Wu of the Han Dynasty was hollowed out, the Zhaoling mausoleum of Emperor Taizong was swept away, and the bones of Emperor Kangxi could not even be put together. Why can Wu Zetian's dry mausoleum be immune?