I asked many times since i travel around Thailand ALOT! Camping here and there and staying away sometimes 1 month at the time different places. They do not care where you stay you report the first when you come inside from another country thats it no local travel inside Thailand.
Yes you have to report if you stay IN Thailand 90 days if you not then not report it. If you live in Bangkok not report it as well, if you stay first night hotel let them report it
You can get a multiple 90 days and a 60 days after that. There is no limit to 90 days one time as far as I know I did my multiple o in Sweden and Penang