Easy gents, let's play nice here. We're all grown ass adults, yeah?
I've found two bolts on the mid section of the radiator support. If I twist the mounting flat bar for the hella horns, I can get them to stay within the bumper cover but angled upwards such that the sound projects to the outside, instead of inside.
I'm a big fan of those lower grill meshes, but to be honest, it's REALLY easy to work on the stuff between the bumper and the radiator when I can access them from that gap. Hell, back when I only had hella horns, I installed them without ever taking off the bumper/grill thanks to that.