I went to Chaeng Wattana and it was a one stop shop. 60 days Covid stamp, no return in 2 week. Everything was done in one step. Every place maybe different.
All facilities are provided for you at Chiang Wattana Branch. Passport photo's and photocopying facilities. They even have glue there for you to stick your photo on the form. The downstairs area is fully open with banks and shops etc. Everything is there don't worry.
I was in and out in 20 minutes for the extension - it was the Patong Office however on Beach Road. You can do all the photocopying there for a small fee. Get your ass in there this week and get it done.
I am in a long stay Hotel and there is an App they use to Register me staying with them to immigration/Government etc. They have printed a hard copy of this for me both times I've been to immigration. This is effectively your TM 30 and I also bring my receipt to immi. Some of the lower end hotels 'forget' to register us thru the App but the higher service based Hotels are usually on-point.