I have a Navalert on the way. I'm too lazy to remove and hide the Navalert every time I park. Since it looks like a radar detector, I'm afraid it will be a target for thieves. That's one reason why I mount my detector to the headliner.
I don't have any room on the steering column or front dash in the mini cooper. I was thinking of placing it on the windshield dash but covering it somehow with vinyl to disguise and blend it in. That way I can truly use it as a HUD for speed. My 9500i displays speed as well but it is awkward to look up at it just to check speed.
If GPS acquisition is not an issue, I was also thinking of just mounting it next to my radar detector to the headliner or below in the console so I can at least hear the alerts but of course the display would be out of sight.