I will ask at the Chiang Rai office and point out the police order and their own instructions which says “two months”...nothing else, just two months. Thanks
For the extension in Chiang Rai they require the following: Tm7 application form + 1 photo
Passport and copy
Visa page copy ,Tm6 entry card in passport,copy wife ID card, copy Wife housebook, copy Marriage certificate, copy Kor ror 2 form - can be obtained at the Amphoe office for 20, baht 1900 baht
Consider your budget, know the locations of Thai Embassies and Consulates, check transit options and hotel prices...go where you might see something different with the required documents and try to travel back in at a land border.
Also, make sure the embassy or consulate is open on the dates you want to go and if an appointment must be made prior for a specific date.