Mine isn't in the engine bay, it's in a box, stashed in the rear os sometimes on rear floor along with other recovery gear. Following this thread but don't think there's enough space in a 3.6R for a mount under the hood with adequate ventilation.
I had the same issue when I bought my new 2016 OB. I traded a 2014 Jeep Wrangler that had on board air. There just is no good place on the OB to install one. So I bought a Vair 400 portable compressor that I keep in an Army surplus bag in the back with other recovery gear. I’ve used it a few times to air back up and it works great. I have used it twice for flat tires that I did a roadside plug as that silly donut spare is a pain to deal with.