Question for you blokes. I would like to purchase a Valentine 1, however I do not want to hard wire it because I want to be able to use it in my other cars. What is the best placement of the unit on the winshield for optimum performance? And does hardwiring the unit have an advantage over non hardwiring except of course for tidiness? Thanks.

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-2006 E53 (X5 4.4) Titanium Silver, fully optioned (sports package, premium package, navigation, ride height adjustment, panorama moon roof, rear climate package). Aero kit installed plus set of staggered 20s with Diamaris tyres.