Actually, for a moment let's consider only the rear set of pivots, or hinges. As far as I know, the job of the rear mounts are only to hinge, while the front mounts need to hinge and slide. Are the rear hinges concentric? That is, do they share one axle? Or if not, are their axles on the same axis? Or are they offset? Without a photo of the bottom of the plate and hardware, it is unsure.
But if they are offset, I think they would not be able to hinge. In this case the rear of the plate will be "locked" in place, relative to the board. You can imagine a simple door where the hinges are not concentric by a few centimeters. The door won't be able to open without seriously stressing something or ripping a hinge out of the wall. I'm just curious as to what's going on under there.