Pinoy adventure
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Leo -you can get a specific drill bit too drill tiles which helps a lot. The name of the alludes me.Unless you're using small mosaic tiles and get lucky, it's simply not possible to future plan tile alignment to ensure that a hold would only require mounting points to be drilled along joints. Many of the grab rails use three fixings in a triangular pattern at each end.
Tile positioning should be dictated by the dimensions of the tiles and your space to ensure you end up with even sized cuts at both ends of a wall.
It's usually easy enough to adjust the position of a hold by a cm or two to ensure that you're not drilling too close to the edge.