I've got a viair compressor.
They make several different duty cycles. Mine is 25%, rated at 15 minutes on, 45 off. Similarly priced to the HF one. 100% rated units are over 4 times the price.
I managed to fit it under the hood of my subaru along with the relay and pressure switch, and ran a 1/4" nylon airbrake tube next to my brake lines by the rocker panels to a 3 gallon tank in the trunk. Then I've got a 25' polyurethane coil hose coming off of that, with a quick release end (and a ball valve behind that, because any leaks will make the compressor run a lot, and quick release ends seep a lot of air), and an air chuck and impact gun with my other junk in the trunk.
I put a switch on the dash to kill power to the relay (in case something leaks while I'm driving), and the power to the relay comes from a circuit that is only on when the ignition is on (so an air leak doesn't drain my battery overnight).
Then, the power from my electric horn circuit opens the solenoid valve to my air horn. Ok, so the filling tires was just a bonus. :)
Now how I fit a 24 1/2" long Grover 1510 under the hood of a sub-compact is another story . . .