The cabinets above the vertical basin should not be too big. Generally, they are only .6m * 1m, and some are equipped with mirrors of .8m * 1.2m. The maximum size is 1m * 1.4m. It can't be bigger! It is recommended to choose .8 m wide *1.2 m high, so that there is about 4 cm space on both sides after installing the mirror cabinet, which is comfortable to look at.
In addition, we can consider setting up a cabinet on the wall behind the toilet to put toilet cleaner and toilet paper, which is very practical.