There are many kinds of Gong Zhuang, which are basically created for practicing footwork, and their functions and effects are basically the same, so no matter which one you choose, you can exercise footwork well.
Many people who practice Tai Ji Chuan are standing pole-less piles and mixed piles, both of which are explained and demonstrated in detail in Baidu.
As the saying goes, the most important thing is persistence. Finally, I wish the landlord success!