What is the best way to execute a border run from Thailand to Cambodia while on a NON O IMMI visa extension?

NON O IMMI VISA EXTENSION AND BORDER RUN

i am on my 3rd extension of non-o-immi (retirement).

i plan to leave thailand once this extension expires, but i will require 2 more months of stay to see the end of my rental contract.

i am based near pattaya

how should i do a border run?

and what are the requirements both side of the border?

my plan would be:

at the end my extension i exit thailand and enter cambodia at nearest entry which is poipet, where i get tourist visa on arrival.

how long should i stay in cambodia to be allowed back to thailand on a 30 days entry stamp?

and what are the requirements to reenter thailand? (flight out, cash, etc)

then in thailand i apply for a 30 days tourist extension.

is there anything flawed with this plan?

many thanx for contributions