Yes, you can apply as a consultant. Detail how you work online, clients must be non Thai, provide company registration, letter of permission to work remotely in Thailand. Check the main DTV group on FB for lots of tips. No minimum income requirement , need to show 500kTHB/embassy currency equivalent in personal bank account.
1 is the way to go if you are the main applicant with your wife and daughter as dependents. Note, Malaysia is the strictest embassy to gain approval from e.g Need to book 6 months accommodation,. Check the threads for application info.