Is the millstone buried underground good for feng shui?

The millstone is a white tiger, which is generally used for porch feng shui. Used by the Castle Peak Evil Spirit or the Duan Long Yin Evil Spirit. However, it must be placed after surveying the actual terrain and the situation of Jiugong, otherwise it will be harmful to people's health. This thing will suppress the earth's atmosphere and affect Feng Shui. Unless this place is shady, use a millstone to suppress evil spirits. Otherwise it will be fierce.