The bath and sanitary fittings brand called Abagno also carries what's known as an exposed shower column system as seen in this example here. You can get the cheapest then slowly mix and match the rain shower head like this and hand shower like this or any of your own choosing later. Some of them can swivel the rain shower arm which is especially useful if it's not centrally mounted as it usually is most of the time.
Without the swivel arm for the rain shower, the bathroom window most likely will receive the water most of the time.
Other established brands sells also like Johnson Suisse, Rubine and VTO. The last one is my favourite as seen here although the Rubine is also versatile as it allows not just rain or hand shower but both at the same time (all depends upon the flow rate to drive both).
Be careful when choosing this as there are three types:
A. Shower mixer / bath mixer attached
B. top shower plumbed retrofit with hand shower diverter
C. Instant water heater inlet type
Type A is when dedicated hot and cold plumbing are already built in. Most likely what you need would be type C.
Type B retrofit only when too lazy to hack so compromise is hand shower would have hot water so long as 20A electrical point is made available but rain shower (original overhead fixed shower) cold only. It's pictured in this thread in this post as asked by fahmiyaeii with one sold by VTO and also Grohe.
This post has been edited by halcyon27: Oct 19 2017, 08:04 AM