Standard measurement for the installation height of the built-in shower fitting?

Hello,
our installer mounted the shower fittings at 112 cm above the floor of the shower tray during our bathroom renovation. Since we are relatively short, the rain shower is now hanging over 2 meters high and is unusable for us, because if I want to clean it, I would have to bring a ladder into the shower.
We have a shower system Grohe Euphoria.

Is it a property or a rental unit? If it is property, you should have coordinated with the installer that you wanted everything installed lower. By the way, I also need a small plastic stool to be able to clean the last corners in the showers. My alternative: my men wield the cleaning rag. ;)

We have also individually coordinated the shower rods with the installer to suit us...

We too, but the smallest is 1.58 m and the tallest 1.88 m. ;)