A method for installing an accessory for a bath includes attaching a first mounting bracket to a structure; placing the accessory on a first side of a system wall that is visible after installation; placing a second mounting bracket on a second side of the system wall that is not visible after installation; attaching the accessory to the second mounting bracket through the system wall; and attaching the second mounting bracket to the first mounting bracket wherein the system wall has a first portion that is both parallel to the structure and extends above the first mounting bracket and the second mounting bracket, and a second portion that is both parallel to the structure and extends below the first mounting bracket and the second mounting bracket.