you should absolutely read up on the law in Thailand,as you are giving shit advice, or should I say no advice at all, you are only saying everyone else is incorrect without offering any alternative ideas.
you still need a certificate of residency from immigration and they will not issue you one if you are on a visa exempt entry stamp. As the OP didn’t state how long he stays in Thailand per visit and what if any visa he uses it’s impossible to give him the correct advice.