Buddha statues should be placed in the upper position, not in the lower position. It is not very important or taboo to face east or west. You can sit east or west, but it must be noted that Guanyin Bodhisattva cannot be placed in the north. A red paper should be placed under the Bodhisattva, and there must be a fixed wall behind the Bodhisattva.
Taboos for placing Buddha statues:
Only vegetarian food can be used for sacrifice, and it is only suitable for sacrifice with flowers, fruits, incense sticks, ghee and green tea to show respect. Therefore, if it is put together with other gods, other gods and buddhas can't be enshrined with three sacrifices, which is one of the reasons. It is also necessary to keep the altar and altar dedicated to Bodhisattva clean, and the Bodhisattva statue should not be defiled by filthy things. Sacrificial items such as flowers and fruits should also be kept fresh, withered flowers should be changed frequently, and rotten fruits should not be sacrificed.