need a good place to mount firetruck horn

I found a salvaged firetruck horn at an estate auction for 40 bucks, its a Grover 1510, i plan to strip my Viar compressor out of the taco and replace it with an arb, the put it on the Cummins with a 5 gallon air tank. looking under the truck i cant really find a good place to mount a 3ft long horn...ive heard people say it doesnt sound good sideways or under the hood so im looking for a good place to mount it, and in the future if i can find one get another lol

 

IDK about first gens but on the inside of the C frame is usually a good spot, its where i have the tank for my OBA.