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Yep, if the concern is not having enough backing for Wonderboard (I dislike Wonderboard myself and try to not use them) and over time with the kicking of the tip of one's shoe causing the tiles to crack, I suggest blocking them off toe nailing (or screw) with a 2x material so its sits flush with the riser on the stringer. Install 1/4" hardibacker, tile over it. Of course this is after you get rid of the squeaking.
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