I bought the XVIDA "charge pad" as well for my Jeep. If you have the suction mount product, this is the same magnetic charging block but with no mount (except for a flat plate.)
The Jeep already had a mobile phone mount by Proclips. Proclips sells all their mounts in two pieces ... the mount piece is customized for every specific car model while the holder piece is selected based on the phone you use. You then connect the two together. They haven't made their Model 3 mount yet, but even when they do they don't have QI wireless holders - just a slide in holder and you have to connect a cable. So, what I did in the Jeep is modify the Proclips holder so that it was just a flat surface. Then I took a metal plate off the back of the XVIDA change pad (the back of the XVIDA charge pad is also magnetic and the plate just pulls off) and screwed it into my Proclips holder. I did try it with tape first, but with this out in the sun that just lasted a few hours.
This works extremely well. The magnets on both the back and the front of the XVIDA product are very strong (I also have their iPhone case) and it doesn't fall off unless I happen to bump it with my arm.
For the Model 3, I have the XVIDA suction cup mount but not sure I love the options for mounting it. When Proclips releases their Model 3 mount, depending on where they designed their mount to work, I may buy that and retrofit it for the XVIDA again.
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