It varies, my DW and I disagree on how to support it, I sometimes give in to her silly ideas. BTW it was her silly idea that failed.
I have posts in the middle of the run and I throw the netting over the posts. I like to use something smooth and round so the netting can move back and forth, the problem with that is wear. I also like T posts on the top of the supports. The more you spread the weight the better in my mind. I think I have some pictures that will show it.
This is basic, I have made some changes but not many.
I just use a mixture of wild bird seed, corn, oats and Boss to treat them.. oh and table scraps.