What documents do I need to obtain a residence certificate in Chiang Mai if I live in my wife's house?

@Brandon ***********

And, how do you make TM30? Just walk in on your own and tell "this is my TM30", take it?

You can not fill TM30 yourself. It has to be the landlord, your wife or whoever. They need their business registration for renting.

They can give you their login and password for subsequent (if needed) new TM30, like after going around and changing addresses (travel, hotels).

Living with whatever person is accommodating you, they must log it in online or go with you to the Immigration office with their ID, Blue book, could be more , even marriage certificate.

Big but, BUT, if one does not need any services from Immigration, TM30 can be freely ignored.