There are also accessories that glue/suction to the wall as extra brackets for a hand-held shower unit. Some people like to put them at stomach-height either to spray their belly or to be able to sit in the bath while rinsing the shampoo out of their hair.
Look at Bed/Bath/Beyond or similar places for a universal bracket. Or contact the manufacturer of your shower-head for one that fits the handle properly.
–G!