Mounting Framless Shower Door To Fibergalss Shower Insert
You need to install it with screws into the studs. You will need to find longer screws than those supplied, preferably stainless steel. You may have to go to a marine supply store. When fastening you will need to take care not to over drive the screws, which could distort or even crack the fiberglass surround. The surround itself is not substantial enough to use with anchors for supporting the door.