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If the shower floor is not smooth or has tile joins we recommend you use our round plastic shower discs (SD). These discs are adhered to your floor using an adhesive sealer and the suction cup feet can then stick down to these plastic discs. We recommend using a sealant and adhesive based on STP polymer technology that offers adhesion to sanitary, bathroom and plumbing materials such as hard plastics, acrylics, fiberglass, ceramics, marble, granite, metals etc, even when wet. Please check your particular situation with your local hardware store and refer to this resource.