I would like to let them free range but too many things likely to snatch them up. Neighbors on both sides have dogs, occasionally have entered our yard. I've seen hawks carrying off small birds. Used to have a metal tub sitting on the porch that collected rainwater. Also collected junebugs. Had a coon come up one night and give the wife a fright. Apparently he was fishing out some treats and his body wight had tipped the bucket. Once he hopped off it came crashing back down. Owls and coons are nocturnal though so they wouldn't be as much of a concern as dogs and hawks.
No, more likely I'll fashion a pair of trusses into a tractor I can move around the yard. Maybe when I'm better established I'll let them free-range. Starting out it's too much of a risk for me.