Hi, I am looking for advice on putting in a new shower. it will be 80 cm wide and the glass screen will be 120cm long. How long should the shower tray be? 120 or 160cm? I don't want to pay extra for the 40cm for a resin tray for nothing but if it helps reduce the water on the floor from the children it might be worth it? I am not sure what's best and see different layouts online. Thanks