FWIW,
My Escort 8500 X50 is mounted just left of the mirror, at the very top. A great location out of view, the cable just hangs over the mirror, (very handy since my weather changes hourly here and I find it on occasion disconnected from the wind shield, keeps it from falling 2.5 feet). I have had escorts since they came to be, (still have the original escort in a box, a classic). Love the thing. Have always been happy with it. As a matter of fact have not been tagged since High School (500 hp 1971 Trans Am, My Bad). IMO, Valentine is very overrated, (brother has one, false alarms all the time, he has been pulled over several time because he gets tired of them and gets tagged, I have not had that problem).
Regardless, just mount it left of the visor, high on the windshield, best of both worlds.
JMO.
Barrett