How to create a shelf in a shower recess without damaging tile?


I am about to move into a retirement village. The shower recess has shower curtains on two sides and tiles on the other two. No provision at the shower head attachment for hanging a shower caddy for shampoo, soap, razor etc. Can someone help me for ideas as I don’t want to damage the tiles by screwing a shelf on, and do not trust suction cups.

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