I have done 7 visa exempt in a year before, but only stayed 10 days each time. Never had a problem. But I would recommend getting a none O before you come. Makes everything easier.
I have just applied today. I put down the address of a hotel I have stayed at before. I have had a visa before, they do not check the flight, or the address.
If you are getting one to open a bank account, you go to a small office around the back of the main building. It’s 500 baht, and only takes about 10 minutes.
It’s done online, for the none O there is no place on the form for insurance. I have recently done it, if you don’t have the 800,000 laying around, Anna visa in Hua Hin will do a multi entry one year extension for 28,500. That is if you have the none O, and a bank account. She is doing it for my friend.