On my 2012 150 I tucked it up next to the drivers side hood gas strut.
I moved the wiring harness there over a few inches.
I too did not want to place it anywhere down in front behind the grill where it would be vulnerable to all kinds of weather.
This also allowed a very short hose to the brake booster hookup.
I also took the LED brake light indicator light , that comes with the kit, and put it up front with the dash in the RV.
I tied it into the actual brake light switch on the truck's brake pedal and used the spare wire in the Freightliner trailer tow harness to feed the light up front.
In the trailer hookup jumper from the RV to the toad I intentionally did NOT use the brake light feed.
Now I can see for a fact that the toad braking works because the indicator light up front tells me that the brake pedal is actually being depressed in the truck!
I think very very few people have done this mod to their rig but this way you KNOW that your toad braking works.
Also I am extremely happy with the AFI's proportional braking performance as the harder or softer that I apply the RV brakes the toad's actuate accordingly.
With this setup you feel very confident that if you need too you can almost "stop on a dime"!