ᐅ Projection of recessed ceiling shower head

Hello dear members :-)

We are currently planning our bathroom and are interested in the Grohe Euphoria Cube series.

However, the Rainshower overhead shower is specified with a projection of only 286mm (11 inches), which cannot be extended. This seems quite short to me, as most others are around 400mm (16 inches).

Does anyone here have this system or a similar one? Or a good idea on how to effectively extend it? Unfortunately, Grohe does not offer a suitable alternative.

By the way, the shower is built-in with internal dimensions of 1m x 2m (3.3 ft x 6.6 ft).
Thanks in advance ;-)

Ask the supplier/manufacturer why it is so short and how it can be extended.
Examine the shower heads in the showroom, measure them yourself, and then imagine how it would fit with 10cm (4 inches) less to decide if it works.