2021 chevy silverado 1500 trailboss Alternate install

I was just wanting to know any ideas on an alternate install for the hornblaster rhino setup other than in the spare tire spot? I’d rather not eliminate my spare. Any ideas would be appreciated.

For my sons truck, I am going to use a watertight container for the components, use QD connections, so I just have to mount horns and solenoid switch underneath. Should be fun