Thanks for the concise easy to follow Thread.
We have long had Amazons with zero restrictions, allowing free-flight and walk-about life-style within our home. It is important to understand that it is an earned life-style as allowing any Parrot such a life style can be problematic.
Commonly, it starts with a Parrot that is self-entertaining with the extensive Parrot safe toys provided. Whether a flyer, a walker or both, your Parrot is recalled trained and will respond when asked. That also applies to Contact Calls as "where are you" become very important.
For a single 'Bird Room' doors become very important as they are very dangerous whether opening or closing. Being able to determine whether your Parrot is waiting for your arrival and is standing on the other side of that door is very important As stated above, cord and cables are a real no-no even for the Parrot that has never had an interest in them. One of the tools that can be used is to use the 'Baby Safe' guidelines. The only difference is that if your Parrot is a flyer, all levels of the room becomes more important from the very beginning as there is not the steps between a crawler, a walker and a climber.