Best to give them the whole ball of wax and highlight any transactions that are relevant to the application. Make sure your employer writes a letter that specifically mentions Thailand as an authorized location for remote work.
Typically the US consulates don't ask for a seasoning period. Your husband the main DTV Holder will apply and once approved then the spousal and dependent visas can be applied for referencing the main holders Visa number. A strong bank balance to support the family with a sponsorship letter will go a long way to show financial Independence and stability. When you select your current location on the evisa portal, your application will be directed to the consulate with jurisdiction over that area.