I had a hawk checking out my city chickens today. I really never thought I would have to worry about wild predators. The top of my run is not covered. Bad- I know. It's a large square about 20' x 18'. The fence sides are 7' tall. It's built into an L shaped corner of my house and 3 season porch. How do I attach netting to the 2 sides of the run that are covered with metal house siding (house and porch)? Does the netting need to be very tight or is it better to have it loose?