OP: I tried the same thing that you are doing with mounting on the visor. I have to tell you, I hated it. There were 2 reasons for this:
1. Very inconvenient when you want to put the visor down. The radar detector really interferes with the functioning of the visor.
2. The V1 is heavy. It makes the visor vibrate and makes annoying noises.
Ultimately I wound up installing the Escort 8500ci PLUS remote. It is not as sensitive as V1, but it is very much out of the way and also it warns of red light cameras (has a GPS antenna).
Hope this helps.
I tried mounting the V1 in many other ways, and it just irritated me because it was SO visible to a casual observer. This is why I ultimately chose the Escort remote.
'02 Honda S2000, 2012 Silver Focus HB, 5 spd Ordered August 13th, Build Date Sept 19th, delvrd: 9/29/2011. Sport pkg, Moon Roof, Winter Pkg, 203A