Anyone has experiences of 60-day extension at Nonthaburi Immigration Office?

Hi guys,

I'm Vietnamese who came to Thailand on Feb 2020 which Non-B visa. I applied 60-day covid extension several times at Cheangwattana Immigration. Everything was easy. However, I've just moved to live in Nonthaburi this month, my current extension ends on May 29, so I plan to go to Nonthaburi Immigration for extend again. 

I have 2 questions:

1. About the required documents, is there any different from CW? The current documents that I already prepared include: TM7, STM2, Acknowledgement of Overstay, Affidavit, Photos of passport, TM06, TM30 screenshot from mobile app.

2. I read from Nonthaburi Immigration post on Facebook, said that they allow only 20 people/day for visa extension purpose. Does anyone have experience about how crowded are there in Nonthaburi Immigration? It'd be really upset and waste of time if I come to the office and cannot get the queue.

Hope I can get some answer and thank you all.