Installing a grab bar in a tile shower can be a intimidating. This video shows how it’s done by an expert contractor. Ultimately, the plastic anchors provided by the company were used with a very good fixation to the tile. Back up of toggle bolts were available just in case fixation was inadequate. However, the plastic anchors did the job, and no toggle bolts, which require larger holes, were needed in the tile were needed. Hope this is helpful.