Similar DTVERS have been approved in the UK. Essential to show how you manage the properties online. Check the main DTV group on FB for tips from such applicants.
You have to do the 90 day report if you styed 90 consecutive days. The first time must be in person at immigration. You can leave and enter as you please within the 180 days limit.
I would contact the embassy with your ref number and ask for an update. Cambodia can take 4-6 business weeks. If you were asked for additional docs, then the approval time is reset to zero.