After reading everyone's posts, the only thing I can think of to add is this: Can the jumps be set either on the rail so you have a clear area inside to have a lesson or can they be set up so there is a wide, clear path on the rail all the way around for you where no jumper will need to go on the rail? (I hope you understand what I am getting at).
We have one outside ring set up with the jumps around on the rail, none in the center, so a non jumper can basically have their trainer stand in the center of the ring for a rider to circle around. It works at my barn. The ring is too narrow to pull the jumps off the rail to leave a riding path, but I imagine in a wider ring it would be possible. I don't know where the instructor would stand in that case , though, maybe on the rail?