I currently use the VIAIR ADA unit that mounts to the master brake cyclinder. Works great. Airs up stock KMs from 14 psi up to 35 psi right around 2 minutes per tire.
Before the ADA, I had the VIAIR 300P portable unit. That connected to the battery with the clips you mentioned. That also worked fine. Just a bit of a hassle moving it all around and a bit slower also. If you don't need to air up all that often, this unit would probably work fine for you. Another issue with the portable units, they get HOT !!! You either need to wait for it to cool down before putting it back in the case, or you need to find a place in the back away from other items.