Amazon.com: 3 USA made Ceramic Recessed Shower Niche 3 compartment shampoo shelf. Easy Install, Easy Clean, Sanitary, Will not Rust or Black Mold, Holds 1-32 oz shampoo, conditioner bottles, Soap Holder 3C :
8 Bathroom Shampoo/ Shower Corner Shelf After Tile Add-on White - Etsy
Adhesive Shower Caddy Shower Organizer Shelf No Drilling - Temu