I think I take as much time choosing support structures as I do plants. The only problem is I can't study them the way I do plants on the net with their information. I have to make decisions on the spot. One year I had an absolute field day with finding some beautiful ones at bargain prices (who doesn't love that aspect ?) .. they were called "cathedral window" style ... I wish I had bought a dozen of them because every gardener knows the older the plants get, the more they need support .. something like humans ?
Dr. Rupple clematis is actually on an arbor trellis, but it always seems to fall out on either side. So I use to of my "window" ones to gather it in and keep it under control. What do you look for in support ?