"Not so sure!" star star star star_border star_border I thought this would be the answer, to not drilling into tiles but sadly both my shelves have fallen off in the past week. The surface had been well cleaned and dried before it was fitted, disappointed as no longer feel confident in using it even though I only have a few light objects to shelve. Mrs Ingram - 15 May 2021 support_agent A note from the team Thank you for your review. We're sorry to hear that the shelves have fallen down. We'd recommend to tighten them every month and we're pleased to hear you're going to try this. If you'd prefer to return them to us please let us know and we'll be happy to help.