Patrick, uve seen my RAM mount havent you? Bit expensive, but i used it for my laptop before. I would recommend one though, they dunt move at all when the going gets bouncy.
Other than that speak to kipper, he mounts his on a laptop bracket he got from fleebay.
Oh and Deasy, he has an ipad mount in the range rover.
I've used a sucker mount in mine but wasn't mine so don't have the info to hand. It sits perfectly in the defender just covering the stereo and not much of the screen. Cracking for Memory Map!