So their normally used for boats etc.. And my friend had mounted them on the edge of the four corners.
I liked that you could leave them slack, and then tug a little and it gave you easy to adjust length. And you just pulled the rope away from the base of the cleat out of it's teeth. Which is easy.
What I didn't like was you had to run around the bed lol. And really the ideal thing would be something where you could:
cuff->post->halfway back to cuff and it would connect to something where it would easily be able to slide up or down, (maybe press a button, but then a quick release in case of an issue.