I saw a magnet type holder on display in the Verizon store. It may have been the WixGear, or at least something pretty close. Since there was one sitting on the Verizon guy's desk with a fake phone I couldn't resist testing it by shaking it around and smacking it several times to see what happens. I will say that it took quite a bit of my testing to get the phone to slide even a little bit. On the phone end, the one on the desk was exactly what the product was but the other end was designed as a "stand up" display when in reality the actual product was just a magnet with a vent clip. The vents on my wife's Jk, my friend's 2015 Ford van, and maybe some other newer vehicles may be sturdy enough to pass my test but I don't think my TJ vents can handle it.
This is what I've used for the whole time I've had my TJ and several years before that. Probably in 2015 I bought 3 for $2 each. The first two ended up with the ball breaking off within a year of use due to thin plastic. I was still using the third one when I saw them again at BigLots for 3x as much $$. I thought WTF are they trying to get away with selling crap like that at a higher price but I could see that they were thicker plastic so I looked around, saw nobody near me and tried to break one. I failed at breaking it so I bought it and it's been in my TJ for over 3 years now.