Well, Here is one idea…This is my “temporary” solution… I pieced it together with things I had lying around the garage.
It has worked so well I never changed it. I wanted something cheap, easy and stable but not permanent so I could move it from car to car if needed.
I basically came up with a magnetic cup base. It sits in the rear cup holder since I never have back seat passengers while on track.
It consists of a weighted cup (cut down from a larger plastic cup) with a plastic lid taped to the open end.
I glued 3 small “rare earth” magnets I had picked up at the hardware store to the inside of the cup lid… I gave the cup more weight by placed some convenient sand in a ziplock bag in the cup before sealing it with tape.
The last thing was to stick a small metal plate (left over from a magnetic phone holder) on the bottom of the race capture unit.
Once in the holder, the base does not move or vibrate, the RC unit sticks hard enough, it takes some force to pull it off… I can turn it upside down and shake as hard as I want, no movement.
Re-cap:
Cheap - Free pieces I had laying around, $4 for the magnets
Easy - Put it together in about and hour (gorilla glue dry time)
Stable – no vibration, movement or sound (it has been in the car for about a year and a half now, I forget it is there except when I use it) I can put my seats down without disturbing it.
Easily movable – The only thing that would take a minute to remove is the connection cable to the OBD2 connector which I have run under the center console to up in the dash. But that is just slipped in and could be removed quickly.
Hope that helps with ideas.