If it’s helpful… the first phone holder I put in my Plus Four was a rigid suction cup version, which I attached under the dash between the vents. It worked brilliantly well for me over the summer - see pics -

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… however unfortunately when the winter arrived, the fact the phone was right in front of the vents, meant that the phone overheated!…
.. so I’m now on to version 2 - similar concept - bought on Amazon - just with a longer flexible arm that places the phone away from the vents. See pics.

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Hopefully this will work better for cold weather motoring..!