Thanks everyone for the feedback. I called Delta for more info and they
confirmed that even the short Unifence would absolutely require some support
since it only runs on a single rail, but that I might do OK with the 28"
Bies (home version, not commercial 30") without using any extra support
since it runs on front and rear rails. That's probably what I'll do, but
I'm going to try to find one to look at first...
Denny