Great considerations for someone that wants to try and minimize losses in a free-range flock. I'm glad you linked to the "Hedges for forage and cover" article, as that slots right in to the topic!
Very educational about ways chickens can hide from us and predators. I've learned that Hostas bordering the forest behind us are great cover for them. We have to look under those huge leaves if we're missing a chicken, and that's usually where they are.