A slim frontmount cut into the lower bumper, not inanely obvious but there. And ditch the aircon.
OR keep the aircon and mount a water to air unit you cant see at all.
I personally say the water to air, $&#$% not having aircon, girls dont like being hot and sweaty.. or do they
. And the car will look way more undercover and the intercooler will be much more efficient especilly at low speeds and you wont get heatsoak and the likes of that.
Air to airs dont really reach maximum efficency till around 80kph which is pretty quick hence cars like rally cars having 40L + resevious of water for the water sprayers. 40L=40kg, a lot of weight in motorsports so it obviously is a big problem at low speeds.
And i personally dont like the look of cut out front mounts, especially the excessivly large ones. The whole bling culture has got out of hand. Looks over functionalitty
Maybe im just a purist. Truck sized front mounts on small turbo cars, wastegates on standard turbo cars etc, just for noise and looks. Allthough the sound of a wastegate is sexy, it has to be backed up by the car pulling away, not droppping behind...quickly 
.... haha.
