I’ve got an Atera Strada DL for use on a van with barn doors.
It’s a good solid rack that slides out of the way so you can open the doors. My wife reversed it into a tree, it’s a bit bent but amazingly still slides so it is robust.
It doesn’t fold out of the way when not in use. It’s really quick to fit and remove so not really a big deal to remove. I guess that’s the main advantage of tow ball racks, it’s really easy to fit them consistently and quickly without damaging anything.
The negative I’d say is that the bikes get covered on road crap in winter. The wheels are quite close to the exhaust on my van so I think the rotors do get a bit of greasy film on them after long journeys.