I am also trying to think of the best way to mount on the roof of a car.
I have roof racks and I also have a monopod with fluid base so I can use it as a video monopod. I don’t really want to use the monopod as it is expensive and not discreet.
Something like a selfie stick but with a strong mount or clamp that attaches to a roof rack would probably best suit.
I have been trying to search for roof rack mounts in general online but all that comes up are roof racks you mount to vehicles. I want something to mount onto the rack not the rack itself so it’s been hard to define the difference.