Several different prop guards I tried on different drones were easier to break than the props. They also appeared in my video.
I have seen a quad "walk" across the ground with carbon fiber props that were intact but must have put great stress on the motors and CF arms to the point of breaking. So decide what you want to be the end point of damage.
I have seen a quad "walk" across the ground with carbon fiber props that were intact but must have put great stress on the motors and CF arms to the point of breaking. So decide what you want to be the end point of damage.