So your last remark
@T**
, can be a little less stressful way to stay a bit longer in Thailand. Ask E-visa (tourist visa) a week or so before you fly. Should you already get it just keep the printed pdf in y'r pocket and from 1st of october come in visa exempt (if from exempt country) 45 days, extend 30 days, border bounce (tourist visa still valid within 90 days) and then come in on the tourist visa, which can be extended again for 30 days. Also as above, when you get the visa (.pdf) when you are already in Thailand. So then no visa run (buy visa in other country) needed.