Here are some threads I found by using the search function.
I also recall that a poster who used to go by the name @Taiwan_Student actually went through all the pain and suffering involved with getting his home teaching class set up. If I remember correctly, he indicated that all the steps required to creating a 100% legal home teaching situation wasn’t worth it in the end. He no longer posts under the name Taiwan_Student, and I don’t know his new handle, but he’d definitely be the one to talk to regarding this type of home “buxiban”.