In geomantic omen, there are mountains behind rural houses, but not everyone's houses are built on mountains. Is there a saying?

Judging from the actual situation, a mansion without a backer is still rich, and a mansion with a backer is dangerous. Feng shui is also ever-changing, and there is no fixed feng shui. It depends on the fate of the house and the orientation of the house, and then it can be decided whether the house is suitable for sitting empty or empty.