For about half a year I let my three Royal Palms free-range. I eventually placed them in a pen in October because I was worried about how they'd do in the cold. They did extremely well when they did free-range, none of them died or got ill. They were really a sight to see strutting across the lawn or out in the field.
That being said, they did cover a LOT of territory and would occasionally disappear for a day or two before eventually coming back. They were capable of flying pretty high; their roost was a metal pole six feet off the ground. There was some debris around the area, but nevertheless, they could jump up pretty high. They knew not to go out into the road, but occasionally they would wander off the property.
Good luck with your endeavors!