Hi Dave be very mindful when thinking about bank accounts etc. Happy to chat if you want to dm me. I'm live and work here and a 25 year UK financial adviser. There's a lot of things to take into consideration with bank accounts
I would say run a mile any company that wants you to work here on a tourist visa is actively encouraging you to break the law and means they either don’t have enough Thai staff to support a foreigner work permit or they’re just plain dodgy I’m afraid