In general, your starting point should be to hold the exams in the same format in which most students are receiving instruction. This is not a requirement for faculty, but it is the assumption that lies behind the allocation of classrooms for Fall 2021. If your lecture is remote, no rooms have been reserved for you for midterms or for finals. This is true whether all, some, or none of the associated discussion/lab sections are in-person.
If your lecture is remote and you want to hold in-person midterm exams, you have two options. One is to...