look for the sha+ hotels on agoda or booking.com ...then if u find a suitable one do a search on Facebook to see if they have a Facebook page.some of them can be booked direct through their facebook page.
I done my one night quarantine at citrus grande hotel in pattaya on 24th Dec. Got out Christmas day morning. Done my 2nd pcr on the 30th at bang Lamung Hospital. 2 days later they contact me to say its positive so had to go to hospital on the 2nd Jan for blood pressure tests oxygen tests and xray. Then taken to my quarantine Hotel for 10 nights
I just walked into bang Lamung Hospital on the 30th about 2pm. Gave them copy of my passport and copy of the pink port letter I received when I landed at suvarnabhumi Airport
I arrived Thailand 24th December from belfast and Heathrow with Singapore Airlines. Done 1 night quarantine in pattaya had pcr tested negative. Thai government ask us to do 2nd pcr test between 5th and 7th day after arriving. I done mine on 30th.2 days later I get call to say I'm positive. Into hospital on the second to have blood pressure test oxygen level test and x-ray before getting taken to quarantine Hotel that afternoon. But my quarantine didn't actually start until the 3rd for 10 days.