Using the very good Garmin suction mount I always fit my Garmin 1490T (5" screen) on the drivers window just above the door mirror, it is inconspicuous from outside the car easy to reach, does not obscure the door mirror and is easy to look at (just as easy in fact as glancing in the rear view mirror).
I have had people say that it stops you opening the drivers door window, but window will still lower by about 150mm, enough to pass out car-park money etc, and anyway it is soooh easy to click unit off the window. Cable just drapes neatly across and through the gap between steering wheel column surround and dashboard, with a nice loop in the cable to allow door to open fully.
Using it in this position I have never had a problem with losing satellite signal. I normally use my Garmin for 'safety camera' position and the last few miles of a journey.