Where does the turtle sleep in geomantic omen?

Where does the turtle sleep in geomantic omen? It is a place with good feng shui. You can buy a little turtle and put it at home, let it walk freely, and finally it stops. This place must be a good place. This place is close to water and food sources, and it is convenient to get in and out without being disturbed. You can observe it carefully, which is very interesting.