When I had my handheld Magellan Meridian, I bought a Ram mount with a suction cup base and attached that to the windshield to the left of the dash. RAM mounts are really first rate, I was impressed with mine, I'd recommend them. Lots of options in that catalog for mounting.
I have the Navman hard mounted to the dash, to the left of the steering wheel on the panel.
I have a picture up on a different website, let me see if I can link it:
The ram mount was suctioned to the left of the compass on the windshield, down as low as I could go (I don't have a pic of that).
Hopefully the pic works...