the embassy in Manila told us to write DTV in the box EDIT: I meant in the top right corner next to the other options. On our form it had a box around all of the other visa types.
we were also really impressed with their responsiveness via email when we asked them questions. The Manila embassy does require proof of 500,000thb PER person, including every dependent, no matter the age
we showed 6-7 months of statements. They went through it all in about 30 minutes and called us back to the window to say we were approved and to collect payment. 18,000php is the fee (approx 10,500 thb)