So, after you posted that entering multiple times on a multi entry visa which is specifically designed to do just that will prompt questions from the immigration officer, you have no idea, or further comment on, what those questions might be?
Ok then, that in itself defines the value of your opinion.
If you stay 90 consecutive days in Thailand on your DTV then you will be required to report that fact to the immigration office that your TM30 is filed at.
If your stay is less than 90 days, you are not required to report.
The TM30 is the registration of a foreigner in residence at whatever property you’re staying at, and is required to be filed within 24 hours of your arrival at that property.