If you qualify for the STV you probably qualify for the multiple entry tourist visa. But you have to do border runs and extensions. At least there’s no insurance requirement aside from Thailand pass.
If they don’t provide one, and the last place you stayed was in the same province AND you got a printed copy of your TM30 you can just use your old one if it comes up.
Or...you can skip all those money deposits and seasoning funds, etc and just get a new multiple entry tourist visa each year, taking a trip to Cambodia or Vietnam or Laos or something once during your stay in Thailand.