I’ve gotten very behind. So sorry you had the hawk attack, I read it fearing the worst.

But it seems Pooh and Bernie and Babs have come out relatively unscathed, that’s good. The hawk swooped down onto Pooh, and they tumbled around and off the open run and then on the ground? The constant motion is a good survival technique and probably prevented the hawk from getting a good grab on Pooh. She is lucky. Butters was grabbed but wriggled away losing feathers without much skin break at all, but some soreness later. I do think the fluff and feathers being slippery and thick is a saving grace! Queenie had one or two punctures but very little actual external bleeding, it was internal, from the neck grabs.
I think that some netting will help, but that it should extend to the tree and bushes and if you can extend it to the ground on the other side of the bushes (hug the tree at height and then go down I suppose), that would be best, so that they have some place to run / fly to and to put something like twigs and branches between them and the hawk during an attack from inside the netting. Optimally they would have some height available with the netting, so they can do a vertical jump-fly avoidance maneuver in any direction. If it just hangs down in front with a slot, there’s nowhere to go and I can see them getting entangled and caught against it, and the hawk will use that.
If you’re out there with them when you deploy this then you’re helping to buy some time. But because the ends by the poles are not enclosed it’s not really a deterrent as much as an options limiter (that’s something though) for a Coopers Hawk, or even a Red Tail (the Red Tail here just dropped down onto Butters beside where the netting canopy ended). So if you’re there and watchful that will be good. To the hawks it’s a tunnel to easily figure out and fly around / into / through. Coopers Hawks are pros at woodland hunting, they understand the woodland understory and flying under and between branches. Pooh was at the edge of the open run in the picture, she will be vulnerable there. So give them room to escape to, thus the extended front edge over the bushes.
But I am wholly in the paranoid camp, as you know. If you can create a netted area that is really totally enclosed, even just a temporary spot you can feel assured they’re protected in, so you can nap and relax out there with them, I’d fully endorse that!