In the illustrated embodiment, the processing device 200 includes a base 202 having an outer surface that includes a top surface 202a, a bottom surface 202b that is located opposite the base 202 from the top surface 202a, a front surface 202c extending between the top surface 202a and the bottom surface 202b, a rear surface 202d located opposite the base 202 from the front surface 202c and extending between the top surface 202a and the bottom surface, and a pair of side surfaces 202e and 202f that are located opposite the base 202 from each other and that extend between the top surface 202a, the bottom surface 202b, the front surface 202c, and the rear surface 202d. In the schematic illustration of the processing devices provided herein, the base is a rectangle with the front surface, rear surface, and side surfaces of that base oriented perpendicularly to the top surface and the bottom surface of that base, but one of skill in the art in possession of the present disclosure will recognize how the base of a processing system may be provided in different shapes with its front surface, rear surface, and side surfaces oriented at different angles to its top surface and bottom surface, and how those angles may be considered as substantially perpendicular while remaining within the scope of the present disclosure as well.