@Mat****
when you arrive in Thailand, immigration will ask you for your onward travel stay intentions, so have the address details on hand when you arrive too.
Just as an aside: I have arrived twice under Covid restrictions. The first time in January and a “free spirit” gentlemen told the documents pre-check officer he didn’t know where he would be staying as he was going to “travel around”. The officer very politely repeatedly informed him they required him to give an address. Eventually the officer told him to go to the back of the queue and come back with an address.