Browse our range of poly marble, stone resin, ceramic, and acrylic Rectangular Shower Trays. Shop Shower trays with the best bathroom deals! Buy Bathrooms cheaper online! Rectangular shower trays offer lots of space and luxury for you to enjoy your showering experience. Your shower tray gives you a non-slip surface to stand on while showering while providing the right amount of slope to allow the water to drain easily. Shop Rectangular Shower Trays at Bathroom Shop UK. You Can also explore Offset quadrant and quadrant shower trays.