It's a matter of weight. The 620 is a bit heavier. TomTom doesn't sell a vent mount for the 620 because of that. It does put quite a bit of stress on them. But there's a good solution that mounts in the same spot.
I have procured a couple of things for a new unit that is the same size/weight as the 620. Have a look at these two items. One, of course, is specific to my vehicle (the plate). The ball fits the 620 and mounts to whatever plate is good for your vehicle.
Just start at https://www was.proclipusa.com/product-finder/vehicle and tell it what you're driving and you'll see what is available for you.
With this mounting design, you can be assured that you won't have the vent flopping around over every bump or even breaking a vent louver due to the weight of the 620.
thankful so much I will look into itWill the vent mount for the 520 be good for the 620
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