I was wondering if anyone knew the minimum requirements for getting a Certification of Residence from immigration in Bangkok? Would they do it with a TM 30 from an Airbnb or a TM 47 from a hotel, and what would be the minimum stay allowed by the immigration officer to obtain this?

The goal is to use the COR to open a bank account. I know this is atypical as most would already have a lease , but the reason I am asking is that I am entering the country on a non-immigrant OA for retirement, but because I have a sick parent, I will only be in Thailand for the first three months straight before needing to go back-and-forth to deal with her healthcare. In a perfect world, I would choose to not commit to a one year lease initially and was hoping that getting a COR from immigration would allow me some latitude to open a bank account?

Has anyone done the COR with minimal requirements? Thanks in advance. I’m trying to avoid using an agent if possible.