I've had radar detectors in my vehicles for about 20 years now. In my experience, suction cups will fail at some point. I've used the Blend Mount in a previous vehicle, but with my height and the geometry of the windshield and placement of the rearview mirror it seemed like under the mirror mounting would just kind of be floating out in space and obstruct my view below the mirror unnecessarily. On other vehicles where the rearview mirror is closer to the windshield, the Blend Mount is a great option.
When I got my Ram, I mounted a Uniden R3 similarly to how you mounted your V1.

I don't use my visor much, but I can lower it past vertical before it touches the R3. I also got one of those adhesive mounts for it and it has sat there perfectly out of the way but still in reach for over six years now. Easy for me for reach up and mute but never obstructed the view.
I'm an electrical engineer, but I don't work in RF so this general advice is worth what you paid for it. Not targeted at you specifically OP, but just my contribution to the body of knowledge in this thread. I run my detector with only K and Ka bands active. I disabled Laser due to the fundamental difference of how LIDAR differs from radar. If you receive a Laser alert, the vast majority of times it is either a false positive or you have been specifically targeted by a speed enforcement officer. By the time you are alerted, your speed has been measured, and the cop has already decided if they're going to stop you or not. To me, this makes laser alerting generally useless.
In regards to the debate on high vs. low positioning, it doesn't matter in any practical sense. The way radio waves propagate through space on the scale of hundreds or thousands of feet is impacted much more by terrain than having a detector placed inches higher or lower. The fact of the matter is high quality RDs can detect the radio signal broadcast by a cop's radar system well beyond the range of what the cop would use to specifically target your vehicle.
If you have line of sight to the cop, you will detect the radar signal well in advance of when the cop would try to capture your speed. If you don't have LOS, you will almost certainly detect the radar signal before the cop is in sight and can target you. They're not measuring your speed from around an obstructed corner or over a hill, but you will still pick up their radar before they see you. Placing the detector to optimize detection is pointless. You may get some theoretical gain in detection, but a bump from 2 miles to 2.1 miles doesn't mean anything if the cop isn't going to try to get your speed until you're within a half mile (these are made up numbers).
Short story long, if a cop has their radar on, it is broadcasting radio waves that your RD will pick up well in advance of when the cop would actually capture your speed regardless of visibility or terrain or any other circumstance. If the cop didn't have their radar on until you give them a reason to...well you get to learn why they're called radar detectors and not cop detectors
