I've got a hypothetical scenario. If I fly into Thailand, stay in a hotel (who does TM30 reporting) for one night and then go and stay in a private residence for several nights who won't do TM30 reporting, would I be likely to avoid trouble? Should I need to make an extension?
TLDR : Answer Summary
If you stay one night in a hotel that handles TM30 reporting and then move to a private residence that does not, you may risk issues with immigration if you attempt to extend your stay using the private residence address. Compliance with TM30 regulations is essential to avoid fines.