What are the requirements for extending a Non-Immigrant A-O visa in Thailand for an American passport holder?

Hello To all,

in reading another post, Q & A, it mentioned a couple options for VISA with no monetary requirements. (I think it was Laos and one in Vietnam)

American passport.

looking to get Non Immigrant A-O ( retirement, base on monthly income) (Correct me if that is the wrong designation)

If I receive a 3 Month (single entry)

and make monthly deposits (65 K)

Will I be able to get a One year Extension at the end of the Three Months?

Or, would I be better off to travel to the USA, and get a One Year (eventually wanting a Multiple entry)?

Am currently making the monthly transfers.

Thanks.