For a large family trip I rented 3 cars in my name without issue at a non aisle branch, KOA.

I rang through to the branch a few weeks after making the reservation to ask them if there was anything needed to avoid any duplication detection cancelling them. The branch employee was very helpful and offered to put a note on the reservations indicating that there were multiple vehicles, i.e 1 of 3.

Had no issues with pick up, all drivers were present at the desk with details etc.

Only thing I had not realized I could have done in advance was to add the driver details myself, which would have helped as the in-branch folks had to add everyone while we were there.