Building a sports facility is a Catch-22 situation. They could use a straight floor to waist railing but then things get dropped through to fans below. In most they build a retaining wall with a short railing or glass to finish the height. The problem is now you have a climbing wall for small unattended children. If you slide the railing closer to the inside you weaken the fastening points. You can do a side mount on the outside and roll the handrail over to match the inside plane, this doubles or triples the cost.