My felines are pretty well behaved - they're just moggies and so far, I haven't had an adventurous one in combination with glass.
To discourage feline interest, I shoved a load of lemons amongst the bits of glass on the bottom and next up shelves. The smell was enough to make them mostly ignore it as a climbing frame.
But if it's near a window a cat might like to look out of, stick it all down firmly.
If they suddenly see something outside, they'll not pay a blind bit of attention to what they kick over on their way to get a better look.