Ah, yes, I'd overlooked the zones at the corner! One practical issue is that, unless one twists the cable, this approach is presumably going to require 'sideways bands' in the cable, which is not easy/ideal with T&E. Also, rather ironically, the more one offsets the accessories (vertically), the tighter does that sideways bending need to become.Any deviation from the horizontal plane that causes the cable to travel outside the horizontal zone of the accessory can be done 150mm from the corner, on either wall.
Kind Regards, John