"BTW, how are you all planning on using this? Permanently mounted or moving it from vehicle to vehicle?"

I installed it with the supplied velco so I can move it between my 2 X's. I don't want it mounted permanently anywhere - already got a friend who's Jetta's check engine light is on so I'm gonna plug it into his car for a few minutes to he can get the codes.

In my 05, I've got it mounted exactly like the bottom most pic posted by adrian. Probably gonna use velcro in the dash cubby above the shifter in the 03.