For shower stalls install the valve at the standard height of 48 inches or 4 feet.
Shower valve height from floor.
A height of 28 inches or 2 feet 4 inches is standard for valves in bathtub shower units.
Standard height for the shower valve the handle that turns the shower on can be roughly waist high 36 inches above the shower floor or as high as 48 inches.
Height above floor the minimum height for the shower controls area is 38 inches above the floor.
For shower only controls between 36 and 48 inches from the floor is common.
I find if you have a shower valve fitted over the bath then 1300mm off the floor is a good height.
Install faucets at the same height as the valve equidistant from the valve.
Included in the many details are the requirements for showers and proper shower valve placement.
If valve is over a shower tray in a cubicle then around 1m from top of shower tray.