Took for my school before. Stick my camera almost touching the glass panel. A tip: make sure the glass panel not dirty or fingerprint if not, it will reflect on the photo. And some photos will have a reflection due to the glass panel but I took some which I think its qutie "unqiue"? haha...
Yup most of the time u will shoot their back only but if u are alert enough there will be time when they will faced u, then take those shots (hav to be fast also). lightning is also a problem, hav to take into consideration also. From what I did for my shoot is that I shoot some shots when they are facing the crowd or run towards the glass panel (for frontal shoots) and I basically stick my camera almost to the glass panel haha :sweatsm: .
All in all, for the sports coverage I took, squash is one of the more challenging one. All the best for yr shoot.