I got my DTV (workation) in Phnom Penh. Thanks to all the people who posted here who gave useful information.
I didn't overdo the requirements. Just submitted the following:
1. Current bank statement
2. Entry stamp
3. Letter explaining my work (I am an online ESL teacher. [No company])
4. Screenshots of the lessons I conducted with my current students. (My students are not from Thailand.)
5. Screenshot of my LinkedIn profile.
I submitted the application on Feb 4 and received an email at around 22:00 on Feb 17.