In the days when I did pole work (over 15 months ago now), I used to set up about 5 different sets of poles. He would invariably knock them, so when there were no longer anymore to ride, I either gave up or got off and replaced them. Our school is over 40 by 60 though so we have lots of room to do this.
I often used to do pole work in hand because I didn't want to be clambering on and off. I only have 4 poles, currently, hopefully we will have more at the new place and with a school to use perhaps I will do more, especially with the little boys, I think they would enjoy pole work
I used to use five poles and raise the opposite end of each one, to be fair I never had to get off and move them as Belle never knocked them, but I guess it would be a pain in the bum to have to keep jumping off.