Should I send a thank-you note after an online interview?

I had a completely online interview that had 3 parts. A 30-minute interview with faculty, a 30-minute interview with a student, and then a few MMI's. Each MMI lasted only a few minutes and I barely remember the faces and names of the MMI interviewers. The school said if you'd like to send thank you notes, you can send them to the admissions email and they will send them to the interviewers. The thing is, I don't know what to say to the MMI interviewers as I feel I only connected with the faculty and student interviewers. I don't want to seem like an asshole tho and send only two thank-you notes and neglect the other interviewers. What should I do in this case?