I don't know if this will be useful at all but I have just installed my nanocom into the D2 so that I can monitor live data and I was trying to find somewhere to install it. As you can see I found a way to do it quite effectively using an old mobile phone holder that opened wide enough to hold the nanocom. And I can use it for the mobile phone too 
I just cut the ball off the holder (it was one of those that plugged into a cigarette lighter with a long arm) and removed the insert inside the coin tray and drilled a 3mm hole in the tray and a 2mm hole in the ball and fixed it with a screw. Replaced the insert and the coin tray and attached the holder.
As I said, a silly little mod but might give someone an idea
I just cut the ball off the holder (it was one of those that plugged into a cigarette lighter with a long arm) and removed the insert inside the coin tray and drilled a 3mm hole in the tray and a 2mm hole in the ball and fixed it with a screw. Replaced the insert and the coin tray and attached the holder.
As I said, a silly little mod but might give someone an idea
