Hey this one is low cost and will do the job:
ebay swivel one x holder
I used ot use it with my old DHD which now feels so ridiculously heavy!
You can mount it witht he provided suction that holds well enough.
Or if you buy some 3m automotive grade double sided tape
You can mount it on other places that don't have a smooth glass finish.
I had it stuck on plastic trim near the driver door/window.
The surface was mildly bumpy but that 3m held on well until the day I removed it.
Popping the phone in and out, and rotating it with force didn't budge it!
Out of curiosity I also purchased this one
Those protruding clips can probably come off easily.
Some 3m on that flat surface and it will probably stick anywhere.
I like this one because it sticks out and gives a greater range of movement / angle.
Secured near the door you can have your arm rested on the seal and access the phone easily.
Unlike the official (or any other suction windscreen mounted one) which forces you to lean towards it awkwardly.