These absolutely should be monitored, but they shouldn’t exist, at all.
Bring them to a county office or police station, something that always has “eyes.”
Early voting should be outlawed. Go in person on Election Day.
When I turned 21 (yes, I’m that old, couldn’t vote at 18), I was ecstatic to go to the town hall in my little New England town, and cast my vote. We had the old-fashioned voting machines, little toggle switches, then a handle to register our votes. We had the results the same night.