I liked this command strip mount for the honeycomb wall, but I prefer that the command strips be mounted to the side of the wall (vertical) rather than the top (horizontal). Also, I use 4 wall segments in a grid, and needed a double insert to hold them together, so I combined the command strip mount from that design with the standard double hollow insert from the honeycomb wall.

This lets the part do double duty, both holding up the wall with the command strips, and connecting two pieces of wall to each other.

This uses a large command strip; to hold up my 4-segment wall, I'm using 4 of these mounts (2 at the top corners, 2 at the middle where the segments meet), which is probably overkill but keeps everything nice and sturdy even when removing pieces.