Good Morning, David,
My MCR-X is the same as Dave's and yours. I think they're all made that way.
It is, however, much trickier to use in horizontal mode, because you have to be sure that everything is squared up on more than one axis. In addition, you have to rig some method of holding the paper. Unless you take the time and effort to arrange a more or less permanent horizontal setup, it's usually a lot more practical to remove the baseboard and project onto the floor.
Konical