Yes, it will improve the V1 further by mounting vertically:
http://www.radardetector.net/viewtopic.php?t=24690
But I never have tried myself since it gives AMPLE warning normally. Also, the V1 uses a completely different bracket to the Bel / Escorts.
To install?? The standard V1 is like any other detector, it mounts on the windscreen and has a cigarette lighter power cord. It also comes standard with a hardwire kit. It's pretty easy to run the (hard-wire) power cable from your rear-view mirror across the top and down the a-pillar to behind the dash/glove/centre console and tap into power (so long as your car isn't a CANN-BUS system). It takes me only about an hour to do all that including mounting the remote display unit somewhere handy (and I'm no install pro).
If you're meaning the remote V1 then this depends on the car. I usually just recommend a couple of install places to people, to get quotes from.
Stinga, yes, the V1 uses a RJ12 power cable as well, except you won't have the ability to mute the detector if you use an Escort cable. Something funny in the hard wire kit stops you muting your V1 (I tried it before). Would recommend using the hardwire cable that comes with the V1.