Each corner of this awning is equipped with a fixed D-shaped ring and comes with a nylon rope for hanging. The measurement method is as follows: Measure vertically from the D-ring of the sunshade sail to the D-ring, and leave a space of 1.5 to 2 feet (approximately 4.8 to 6 metres) between the fixed point and the sunshade sail. We suggest that you adjust the Angle of the sunshade sail to 20-40 degrees. Tilting it helps guide the rainwater to the edge of the sunshade sail and prevent rainwater from accumulating. This outdoor sunshade sail is waterproof and UV-resistant. It is very suitable for backyards, terraces, lawns, swimming pools, pavilions, porches, carports or other outdoor areas. In addition, this awning can also protect your plants from the sun.