How do I extend my DTV stay and complete 90-day reporting in Thailand?

# Hi all! I just got my DTV approved in Brussels, I'm so happy and thankful.

I still have some questions for anyone who might know:

1. How do you extend your stay after 180 days? If I travel outside Thailand once in a while, will that be sufficient and give me another 180 days every time? Or do i need to apply somewhere and pay an extension fee?

2. I hear 90 day reporting for the DTV is required, is that correct? What's the procedure for this? (my residence will be in Silom, Bangkok)

Thanks!

For anyone preparing to apply, here's my experience:

I applied using the Thai E-visa website (Brussels embassy). The documents I submitted (additional from my passport scans, photo etc) were:

- Certificate of main residence ('Attest van Hoofdverblijfplaats')

- A PDF containing my company registration (from the Belgian KBO website) + a brief portfolio (about 6 pages) of web development projects I have been working on during the last couple of years

- A certificate from my bank stating the current amount on my savings account ('Attest bevestiging saldo', dated 2 days prior to my application date) (I requested this from my bank per telephone).

I waited for 25 days before the visa got approved, the confirmation came per email with a PDF e-visa attached.