I simply put mine through my dash. So there is maybe 4-5 inches from dash up to radar showing and that's it.
Put it in the crease around center air vents and radio running downtown shifter. Pull piece around shifter out and put extra rolled up in there. Then simply pull out plug and your cigarette lighter should be right there. Also use a coin to push it into creases. I've had it like this for 2 years, no problems. Also if you need to hide it you can easily pop off radar and push rest of cable in crease up to radar plug in.