We had the same questions.

The hotel we are staying at in Phuket has told us that if we are positive, we will need to discuss with the hotel on next steps. Next steps range from quarantine in the hotel to quarantine in the hospital. I take that to mean that if you are smart, you can probably quarantine in the hotel (especially if the hotel gets more of your cash).

I don’t want to state the hotel but it’s not a huge chain and it’s a 5 star.