What would be the correct anchor to attach a sliding shower door (the weight is supported by the tub, the screws in the wall just hold it upright) to a tiled wall? The anchors that came with it look like they're for a thin acrylic tub surround. The wall is made of cement backer board with thick porcelain tile on it, probably about 3/4" to 1" thick total. Also, the H-shaped track has some distance between the screw hole and the wall (11/16"), I'm not sure if that has any effect on what to use. It's just that I searched and can't really find any place that says what anchors to use, so I want to make sure.