I see you already figured it out but for anyone else looking at a way to mount their phones and tablets should look into the Expedition Essentials T4RPAM. I'm extremely please with it and is by far the most convenient mod I've done so far. It is extremely sturdy, adds a dual USB port for charging which gets rid of cables running all over the place, and the best part is how customizable it is all the mounts can be moved to 4 spots in the front or 4 spots (IIRC, its 4 or 2) on top. The downside is that it is more expensive, obviously.
This picture is from right after I installed it and since then have moved stuff around, including my phone to the other side of the radio power button so nothing is blocked and the cable is out of the way.