Tee, Were your cuttings all from the same plant? If so, you might find it valuable to get a couple from a different source for cross-pollination. If so, I will send you some from mine.
Regarding location, a fence is good and a trellis will also work. However, I would plan on trimming them regularly. The stems shoot upward then arch over and tip root as much as 10 ft away. I swear that they can grow an inch a day. If you trim them, they seem to grow even faster, but if you don't trim them they will overgrow just about anything I've seen. They don't make a bush so much as a tangled clump of longer stems. If I can't get a decent fruit crop of mine in the next year or so, I will get rid of them all.
Regarding overwinter, I don't think you will have any problems with them outside in your zone, as I am a zone colder and have had no issues with winter survival. However I understand your caution.
