When choosing the equipment to be installed, it would be wise to check with the manufacturer, that it is suitable for the zone it is to be installed. Also an assessment of what if any, potential dangers are by having the open end of the cubicle where the warmer is located
As I understand it, the screen is along just one side of the shower tray. It sounds as if the adjacent side of the tray (where the towel rail is to go) is 'open' (no screen) - hence my comment that the rail (1m from shower head) will probably be within the (unimpeded) 'spraying range' distance of the shower head. However, I may have misunderstood.
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