If ordering the z clip, is there a clip at the bottom, top and middle? I'm mostly wondering how well these do if it is just top and bottom and no middle attachment. Also, do they come attached to the backboard when shipped? Thanks!

For the Z-Clip install, there is a clip at the bottom of the pad and the top. The middle part of the mat is connected to the wall with a trim piece that will come with your wall pad. Each wall pad is shipped whole with the foam connected to the backboard with a vinyl covering.