Oh, I thought the mount was attached farther back, in one of the three holes that already has a fastener in it.
The fender top is essentially flat at that forward-most, squareish hole. So the mount must sit flush against the flat top of the fender, bend down to get under the lip of the hood, and then go out straight. I didn't see how that could work with the other holes as they go through facets that are recessed rather than the top surface of the fender.
The second part of the question regarded the routing of the cable to the engine compartment. I didn't see how there was enough of a gap between the hood and the fender to route a cable, at least near those aft three holes. But the forward-most, squareish hole is so close to the headlight that I'm guessing you routed the cable in the gap between the fender and the grill. It would be a little tight, but I can believe a coax could be pressed into that gap without compressing it too much.
Maybe that doesn't make sense, but the bottom line is I think I get it now.
Thanks for the speedy response!