I improvised the design I've seen around the internet, a lot of people use the gutter adaptor on the end, I prefer the 45, since it only allows "helicopters" inside. You can hook anything you have on hand to the eye bolts.
https://www.youtube.com/watch?v=tw96FEDkG7s
https://www.youtube.com/watch?v=tw96FEDkG7s