More often than not, this is the case. Domestication takes thousands of years, not a few generations. It may save your life, someone elses, and make for a happier cat. If there's ever an attack or excape, a blast of CO2 is harmless but will spook a cat enough to get away or direct them where you want them to go. Even though the enclosure won't take up much room on your property, it will be nice to have that large buffer zone around your cat.
Several acres is preferred.
You do not want it visible to the public. If it is, build a wall. Once word gets out, people will come. Out of sight, out of mind. If they are tempted they will approach the cage and stick their fingers in, get bit, and sue you.