not sure how high up your frame goes. My concern is that your LO will hit head on the hard wooden frame & sounds like there would be a gap between your mattress & the cosleepers perimeter frame. The gap is a potential issue for body parts (hand, leg...) to get stuck in.
The strap has a rectangular plate at one end, and goes across to the other side of the bed.
Re: Arms reach co sleeper
The strap has a rectangular plate at one end, and goes across to the other side of the bed.