Back to the top 4" PVC cap of the tower...How you choose to hang your tower is up to you. I prefer to drill four 1/16" holes around the cap (1" down from the top) and twist in simple cup hooks in order to give me 4 support points. It also allows me to more easily adjust the hanging angle of the tower over 1 ceiling hook (more on this later). Be sure to put a matching mark on the tower body and the cap so you know that your holes in both pieces are always lined up correctly if you have to take off the cap and put it back on.