Which Immigration Office in Chiang Mai is best for a 30-day visa extension on visa exempt status?

Hello, All, looking for the Chiang Mai Immigration office to get a 30 day extension (on visa exempt status). Is it:

Chiang Mai Immigration Bureau, No. 71, Moo 3, Suthep Subdistrict, Mueang Chiang Mai District, or

Promenada Chiang Mai Immigration 192-193 Moo 2 Tumbon Tasala, Amphur Muang?

Also, do they want only one copy each of your passport photo page and stamp? (I've searched here, other groups, and Google, but can't be sure I have up-to-date info.) Thanks~