The mabu can be high or low but the body needs to be rooted with a yin yang difference (the side pulling the bow open has more weight than the other) and follow the gravitational force and not to strain your knees by pushing it too far forward or to one side, plus the qi must to sink to the lower dantain.

Look at all the pictures and see who is the most comfortable and stable and can stay in the posture the longest (zhanzhuang) and that would be the best way of doing it.