Do I need to report in person for my 90-day check-in if I leave Thailand every 90 days on a DTV visa?

No, you won't need to.

As other people have said:

1. Since you aren't in Thailand for 90 days you don't need to. Technically you can do <97 as there is some leeway

2. It's fairly easy to do the 90 report, but can take some time depending on where you have to do it. It's over all painless but does take a good part of a day + prep

3. Supposedly nothing really happens if you miss doing the 90 day report unless you are dealing with immigration in other matters. Personally I do my 90 day report

4. Unless you are really wanting to travel it's probably not worth it just to avoid the 90 day report

You're not here for 90 consecutive days, so no.

You ask do you have to do 90day report if you are not here 90days? Really?

No, but 90d report is very easy… so unless you leave the country for another reason its not worth traveling.

Can't understand why people freak out about the 90 day report.it takes me between minutes in chiang mai. Why spend money doing border bounces just to avoid the 90 report?

How how do people survive 🤦‍♂️🤣

If you are never inside Thailand for 90 consecutive days you never need to report

No you don't. You can technically stay 180 days and not do the report, as long as you don't need anything from immigration, like a certificate of residence to buy a vehicle or similar.