Two farangs or one Thai? If two farangs it is difficult to get a Trailing Spouse Visa in SE Asia but it could be possible from your Thai Embassy in your home country before travelling.
You can apply for a Non-O as soon as your funds are seasoned which they already may be the day you arrive if you already have a Thai bank account. Not everyone arrives in Thailand without a bank account so they don't have to wait for the seasoning which can occur before you arrive in Thailand.
So you have Thai bank account in your name with 800k from a foreign transfer and you are over 50? Just go to your local Immigration Office and get their list of requirements then prepare all of the documents to support your application.
not renew but get a 12 month extension by meeting the requirements including financial (400k) or a 60 day "Visit Thai Family" extension with no financial requirements