I thought I would share this. It took me a long time to figure out a decent mounting option that would also keep the OBDII cable secure and out of the way.
I'm sure other people have figured out other ideas, but this is what I liked (and involved no visible modification to the interior). I created an opening in the grip area of the fuse cover just large enough to get the AP end of the cable through, then ran the cable from the ECU port to under the dash and cable tied it to one of the metal supports to secure it from falling by my feet. I'm going to order a 90º OBDII cable in the future to eliminate the hard bend in the AP cable at the ECU port.
There are some other minor install photos in the same album (V-Limited front lip, Kartboy SS [I installed the shifter bushings as well, but it was too difficult to get decent photos], auto-dimming rear view mirror, and arm rest extension). I opted to install the last two on my own because it was really simple and would have cost a lot more from the dealer.