What are the requirements for the DTV workcation visa application for expats in Thailand, particularly regarding financial proof and dependents?

Hello, I am US citizen applying for DTV workcation from Ho Chi Minh City consulate with my Russian wife as dependent. We're hoping to get this done this month before early April.

Financial proof wise I have an official investment brokerage proof-of-funds letter showing my assets well past the threshold required for this visa, plus a US bank statement from march showing my monthly income in March. Has anyone been approved at HCM using a brokerage/investment letter rather than a traditional bank statement? How many months of statements did they want and how recent? I earn enough to qualify for both of us but the cash comes to my account every few months, so I am wondering how particular they are about proof of funds.

I'm a freelance with with no employment contract. What did your portfolio look like — did a simple 1-2 page document listing clients, services marketing profiles and income work, or did they want more? Did they ask for a cover letter too?

For my wife, our Russian marriage certificate has an apostille and notarized English translation. Will this be accepted? And can my wife submit her dependent application simultaneously with mine online, or does she have to wait until my visa is approved first?

Any recent HCM experiences please share!