It’s a different effect. The “catwalk” effect works because the mirror below the path is reflecting something that’s actually 15 feet over your head. It requires guests not walk on the mirror in order to even “see” the drop off.
What you’re thinking is probably more akin to the “tight rope” effect in Mesmer (Knott’s) this year, where guests walk on a plexi box with an infinity box (or endless hallway) underneath it.