Here's how I mounted my V1 radar detector. Maybe others will get ideas of what to do (or not to do) with their detectors regardless of the brand.
Suction cup mounts look clean, but the don't work for me. I always take my V1 with me so the mount has to be sturdy (for repeated removals and insertions) and I don't want to have any of the mount come with me to make the V1 even bigger.
So I did what I've done in my past cars. Remove the suction cups from the mount, use the holes to bolt the mount to home made mount and then bolt that mount to the car. I also try to modify the cars as little as possible.
In the pictures you can see what I came up with. It is a metal plate bent to put the V1 at the correct angle. It is held in place by the sun visor mount. The plate is big enough to spread the load of the V1 over a larger area of the roof for stability and to not tear into the roof. The sun visor still works, but the downward movement is more limited than stock due to bumping into the V1.
I would have liked to put the V1 closer to the windshield, but the further away you get from the visor mount, the more stress you are putting on it. If I need to reinforce the mount, it is possible to drill a hole and put another screw under where the visor mount is, but so far this seams sturdy.
With the visor up you can't see the power cord. It would be nice to tuck it away, but since the visor is almost always up, it hasn't bothered me much.
Note: these pictures are old and my current V1 is a newer model and doesn't have the bottom buldge of the one pictured.