Here's a picture from the UofM peony garden that pretty clearly shows what they did. I actually took several pics up close of some of the larger shrubs but can't see the bamboo supports in them! These few were tan rather than green so they show up better. It looked like a pretty simple design, just 6 bamboo stakes pushed into the ground so they were around 18 inches high with heavy twine wrapped all the way around. Several had the twine stretched through the shrubs as well to provide internal support. Seemed to work pretty well and looked like it could be adjusted if needed. Almost all of their shrubs were supported this way, could only see it on the ones that were fairly upright anyway, the droopers didn't show the supports at all.
