I got tired of having my passengers hold my phablet (lumia 1520), and it was useless on the passenger seat when I needed GPS capability. Here are the mounting solutions I used:
Panavise custom RSX indash mount. Screws into the back of the radio trim face on the screws already there (no drilling/modification required. plug and play!)
Proclips USA universal large holder. I chose the universal one because the Lumia 1520 specific one didnt allow for a case to be used. They have custom holders for almost every phone, including models that charge and have hardwiring power abilities (includes the little transformer brick thing)
Pics installed with just the holder:
With the phone:
The mount itself is made of steel and durable/hard as hell. Its made from steel, installs easily, has universal AMPS holes, and doesnt move. The proclips phone holder is great also. A nice OEM feel to the plastic, adjustable (tightens to your phone size via screws), and swivels on a nice ball joint. Overall a great looking and high quality solution to mounting any device in your car (and charging also, if you opt for their charging versions). Beats those nasty suction cup and vent mounts that obscure your view and the AC controls in your car!
Hope this helps anyone looking for a way to mount their stuff
hardwired charging version for the curious: