The SP12's can mount inside the keypad mounting plate - that's my preference, as it keeps the sound right at the keypad where you'd expect it; plus you can throw a few more SP12's around the house to add some fill so that everything is heard clearly. Also if you haven't noticed - depending on your keypads, if you go with the KP2 - the mount that it comes with is surface mount; the flush mount, ordered separately, looks much better. Either one has a knockout for the SP12 speaker - but with the surface mount you'll still need a hole in the wall for the speaker to sit in.