Which floor has the best feng shui? House feng shui taboo?

I suggest you buy the 5th floor, 15, or 25th floor, and the door direction is preferably south or northwest, because the five elements with "5" belong to soil, and the door is above the west or northwest, supplemented by water, which belongs to monkeys and chickens, and the five elements belong to gold. The five elements of snakes belong to fire (yin fire), thus forming a five-element pattern of fire producing soil, soil producing gold and gold producing water.