Santa (I lent him the money) left a Garmin C530 GPS and I am wondering where those of you with a portable GPS unit are mounting them.

I don't want a permanent mounting (this is why I bought a unit that can be moved between cars), I don't want a lot of wires hanging about, I don't want to stick it on the windscreen, since it waives a steal-me flag, and I want to cover up or put the GPS unit out of site easily when I park the car.

I thought of three options:
1. Cut a piece of thin plexiglass out that fits in the cubby hole under the radio and sticks out about 4 inches. Fasten maybe with tape. I can mount the GPS with suction cup on this glass-like surface, and cover up when parking. I tried the suction cup on the small area in front of the door, but it will not stick.

2. Stick an upside down drinking glass with a smooth bottom in the cup holder, and use the suction cup on the bottom of the glass. Again, either pop off or cover up when parking.

3. Rig up some sort of plexiglass piece that goes in the center vents, and sticks out. I would then use the suction cup on the smooth plexiglass.

Thanks!