Free ranging quail is not recommended for a few reasons. The joke is "You can free range quail....once".

Japanese or coturnix quail are ground dwellers. They do not perch like some other types of quail and they are small. They would be easy pickings for all types of predators. Quail aren't smart enough to "go home to roost" every night like chickens or ducks do when it gets dark either. They'll just stay out in the dark. Even easier pickings for predators. Plus, if you're raising the birds for eggs, you'll have a really tough time finding them.

You could build a "quail tractor" just like a chicken tractor. Many people do this. Or you can build a large aviary. I may go the tractor route if the property we buy in Idaho is suitable for it. The eggs are harder to find in a tractor too, but at least they are somewhat contained.