I have a Garmin nuvi attached to the dashboard of my 7th Gen with a KudaUSA Black Leather GPS mount wired into an available Accessory fuse.
The mount attaches directly behind the steering wheel at the 2 o'clock position, so the GPS is situated between the IP and the dash radio controls and within easy fingertip access. I can easily remove the GPS when leaving the car, and the position and mount looks very much factory-like. I didn't want the Garmin attached to the windshield by suction cups with an unsightly power cord across the dash, nor did I want a friction mount that merely sits on top of the dash (and could become a projectile if in an accident).
The total cost, including the $250 Garmin nuvi GPS, Kuda dash mount for the Accord, mini-fuses, and $105 installation by a custom audio shop, came to about $587.00. The shop removed the radio unit temporarily to screw the mount into the dash, so that the screws are totally hidden when the radio is put back in. Well worth it for a non-nav equipped car.
EDIT: Sorry this info is for a 7th Gen, just saw this is an 8th Gen thread.