Is a Multiple Entry Tourist Visa sufficient for my travel plans to Thailand?

The traveler has a plan to fly to Thailand on March 15 and stay for 30 days before heading to the Philippines for 6 days. They will return to Thailand for 54 days before heading back home on June 12. They also intend to re-enter Thailand in September or October for another 45-60 days. They seek advice on whether a Multiple Entry Tourist Visa (METV) is adequate for their travel plans without facing any entry issues. A comment suggests that the METV allows for multiple entries with each valid for 60 days, extendable, provided the timings around the visa and entries are well-managed.