Welcome to BYC! Glad you decided to join our flock. It sounds like you have done a good job predator proofing your coop and it should be safe (as long as you don't have bears). I have anchored hardware cloth down before with closely placed fencing staples and never had a raccoon or any other predator pull them loose, but some chicken owners say that it has happened with them, so for peace of mind, ChickenCanoe's suggestion of covering the edges of hardware cloth with either siding or metal strapping and attached it with screws is probably a good idea. Good luck with your flock.