Hey king I have used them for years cats work the set better if they are placed on top of the cage, I use my double doors and put them in the center, on a single door I would place them on the back. Add a little eye appeal, feather hanging from top and the like it should help, beware of people as they draw them too. I also put mine in a zip lock bag to weather proof them.
By the way thanks for subscribing to my youtube chanel, one day I'll add a few more vids.