I doubt Thai Airways will allow you to board, we had a massive row with them as they thought my wife's tourist visa to the UK wasn't genuine, best thing to do is go to the airport beforehand and ask.
My gf isn't Thai so probably best I get the landlord to do it with the link you provided. Am I right in thinking that the landlord gets a receipt and sends me a copy?
Well I initially came in on a tourist visa so extended at chang wattana, sonce then I've left Thailand twice and extended once at IT Square Laksi, haven't been asked for a tm30 previously, i notified immigration at the border of my address in Thailand 👍