yes OP can do back to back, means run 1, plus 30 days at Immigration, than run 2 with another 30 days extension from Immigration. If times correctly, near year end you can do even 4 border run in a row, plus each time a 30 days extension.
many times I am surprised that people, once in Thailand, let their "guard" down, not checking anything. So far many people lucky as Immigration not fine in such cases, but guys it is " YOUR PASSPORT, YOUR RESPONSIBILITY".