Here is my write up from some time ago on my F10 hardwire install:
My 9500ix install is very similar, except instead of wiring it into the Overhead Console, I installed it by separating the Rear View Mirror Housing, which easily separates in the middle at the seam, and tapping into the backside of the 10-Wire Connector Plug inside it, with +12V (Switched off the ignition) on the Brown/Green wire and Ground on the Brown/Black wire.
In case anyone is interested, the Wire I am using is a "Corvette Radar Detector InvisiCord" from Southern Car Parts.
The InvisiCord has pins soldered on the end of the two wires so they can simply be pushed into the back of the wiring harness. It comes in both 8" and 12" lengths, and while I used the 8", I highly recommend the 12" length, as there is literally no slack in my setup with the Radar Detector centered on the windshield below the mirror housing.
Also, I am using the "Escort Radar Detector SCP Mount" mount from Southern Car Parts as well.
It is much better than the the two small suction cups the 9500ix comes with, and better than the single "SuperCup Windshield Mount" sold by Escort, which I have in my other car.