In fact, why only ask how to build a toilet? You must combine the overall layout of your yard to determine the location of the toilet (of course, in the above four fierce positions).
Second, the size of the toilet: Feng Shui requires auspicious buildings to be high and fierce buildings to be short. So the toilet should be short. In order to show their own style, some people build toilets tall and gorgeous, which violates the requirements of Feng Shui.