Ha, we've got all kinds of answers for you today
This is how I do it- I screw some small hanging hooks into the aluminum frame on both sides of the cage, and get a piece of the green garden center plastic support poles? and cut it to the right length. You can use anything to go across, the small bamboo poles work well too.
xoiceox, I have some pictures of how I hung my pothos in my thread about my cage. I use wire from the craft store. I poke three holes in the rim of the plant pot. I then feed the wire through the hole and twist a nut on the end. I then string up the wires to something stirdy above my cage. You could use a dowel going across the top of your cage.