What should I do about accommodation details for my DTV application in Thailand?

Hello, maybe this question was asked several times, but on a quick search don't find a clear answer:

For the DTV application, regarding accommodation details, what I should do? I'm applying, but I still don't have the accommodation? Should I reserve on Booking.com something for 1 month and cancel it afterward when I can book my definitive place? I will be travelling, so probably won't be more than 1-2 months at the same accommodation. I want to stay in Thailand for 7-9 months. I guess that I don't need a booking in advance for the whole period just to apply to the DTV, right?

Thanks