Mine is very similar to the way Graham's is mounted, except I have the round base. It does need to be screwed directly to the dash, and in some cases as I found out when I moved it from a Ford to a Plymouth van, had to be reinforced behind the dash plastic.
I took a tripod head from an identical tripod to the one I use outside the vehicle and literally superglued it to the RAM Mount. Left it in clamps a couple of days and to date it still holds. This has been an EXTREMELY stable and convenient setup, using the same camera to go from windshield to tripod and back very quickly! It also has the added convenience of having the adjustments of a tripod head handy making panning across the windshield very easy.
It does require some degree of dash/windshield clearance obviously so it might not work in all setups. Whatever configuration though, I VERY HIGHLY recommend RAM mounts.
And yes Amos, that velcro we used is some SERIOUS STUFF! It's the industrial stuff and I completely ripped the memory cover off the back of my new laptop trying to pry it off there. Trust me, the laptops on that setup aren't going anywhere! :lol: Think of your sheer forces though. For the most part, sheer forces in a vehicle are side to side, which is one of the strongest directions for sheer with velcro. With that sitting on that Joto setup, the vast majority of force on the laptop is going to be horizontal.
I hesitated in the past about using a joto desk type setup, opting to make my own rather than spend over $100 for one of those. After using Graham's this year, I will be getting one to go in the next vehicle!