Your coop is looking great!
I have no idea if the Night Guard things work, might be worth a try, though.

Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Bee bee guns are no good. Personally, I keep a 22 near the door at all times. I will shoot anything that tries to hurt my chickens. Even my neighbor's dogs. A person's dogs are pets on their own property. On another property, they are predators and I treat them just so.I think you are right when we live so close to predators or in my case I live with the predators! Everyday I see hawks, foxes and coyotes and they get close up and personal with my barn (we have horses), and even playing with my dogs! I ran screaming bloody murder at that sight with my pitchfork. Yes, I am going to daytime protect the daytime run as well but plan to have them go in the coop at night of course.
Question are bee bee guns any good for protection?
As for location of the coop I was going to put it behind my barn but I would not be able to hear anything at night if there was danger lurking so thinking of putting much closer now.