If i decide on a shower i have a small space only that i could slot a tray in about 760 -780 square. I see Coram do one which boasts great performance and yet seems reasonable. Any views on this one or recomendations please. Existing waste 5 inches from ground, this will not be able to be lowered, i see the height of the Coram is 220mm so i would imagine this would be fine.