Can you post a photo so we can see what you have to work with?
Attach it to a 1x1 then screw to house or. Whatever you have to attach it to.
When I add those over the door mosquito nets that are made for doors with the magnetic closure, I hang the first side so its fastened to the wooden door trim above and down the side (it has cotton twill tape you use large upholstry tacks or small upholstry tacks. Then line up the other side with the magnetic closures fastened, and then adhear the sides. Then if its too long, I trim and make a hem on the bottom, I do mine for my disabled clients so they can use a wheelchair or walker to it just hits the floor with the finished hem.
If its a full porch net with 3 sides, I have used exterior velcro. or you can buy twill tape and put it over the net edges and use tacks or small large-headed nails.