It is best to sit on a mountain or a villa, and there is a god in the eight characters.

You can't say that. There are two main schools of geomantic omen, Bazhai and Kong Xuan. Eight houses are equipped with divination, which is generally effective for health, and divination has little to do with using gods. Kong Xuan has little to do with the use of gods in the eight characters. Seeing the astrolabe determines good or bad luck. Whoever lives in the auspicious palace of the Kong Xuan School will contribute to luck.