A: This edging is not designed for that use, so we do not recommend it.
A: The stakes that come with the package are adequate. A separate wide metal stake is also available as a separate option. My soil is quite compacted so both types of stakes held pretty well. I also made preshaped circular forms for tree wells. They were cut to size and then overlapped and glued, after pop rivetting the ends together. Holds the shape very well that way.
A: Yes, but bought extra.
A: Each roll comes with 5 of the metal stakes shown in the video.