Best way to install fixed bathroom shelves

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My contractor had installed 4 bathroom shelves but three of them have fallen down. These I guess require glue. Is that the problem?

Is there another way to install them so like with screws so it will never fall?

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Best Answer

Usually those shelves are mounted to the wall structure behind the tiles, most often into one or two studs.

You need to find the studs and then drill into them for proper support.

While you should get the contractor back to sort poor work, I would hesitate as they may not know any better...

Often those shelves are mounted first then the tiles are cut to surround the shelf.