yes if you have a exit ticket within 30 days of your entries you'll have no issues. You'll likely not be even asked if you haven't accumulated the days mentioned
it is unlimited but apparently and I can't back this up personally they don't like regular exempt entries. I've had them sit there and calculate my time spent in the country on exempt before being stamped in. I was told this was why. If I hadn't had a exit flight before I'd logged up 90 days I'm sure they would have denied me. It's something to be aware of despite the official rules saying you can fly in unlimited
yes so that's my suggestion. Get a 60 day visa before you come. Could then extend 30 days for a 90 day stay before leaving and you won't have any immigration denial issues
Yeah the 6 month multi entry visa is only necessary if you want to border bounce and just stay in Thailand. A good option would be get a single entry for 60 days. Can see alot of Thailand before you move into other countries and not have to bounce in and out all the time. Also gotta keep in mind if you run up 90 days on exempt entries, you'll almost certainly be denied trying to get back in again without a visa