Remote head kit for this radio is KRK-10.
I'm running an NX-900 in my Ford pickup. The NX-900 uses the same chassis and remote kit as the TK-7180.
My radio is mounted behind the rear seat in a crew cab pickup. The control head is located under the dash. The control cable is run along side some other cabling underneath the door sills. Power is pulled direct from the battery and follows the same route to the rear of the cab.
Putting the radio behind the rear seat keeps it well out of the way, and it's a fairly short cable run to the antenna mounted above the rear center mount stop light. I've got a 2007 Chevy Colorado at work with an NX-900 and an NX-700 mounted under the drivers seat. My wife's Ford Escape has a Motorola radio, the radio is mounted down in the bottom of the center console with the control head on top of the center console. Any one of those locations will work fine, it basically comes down to where it will fit and how easy it is to get the wiring to/from. Keeping the coaxial cable as short as possible will reduce feed line losses. Not a huge deal, but the shorter, the better. Since you are preferring a fender mount, under the front seat might be your best choice, but it certainly isn't the only one.
Control heads should go where they are easy to see, easy to reach, and most importantly, out of the way of airbag deployment areas. A deploying airbag can cause some major injuries if it picks up any radio parts on it's way.
There are a number of ways to mount the antenna on the fender. There are NMO angle brackets that will screw into the inside of the fender between the fender edge and the hood. There are companies that make mounts that utilize existing hardware.
