Yes, Rack Ears are available as an accessory. The MRCC is a 2U device and can be mounted in a standard 19" rack with the optional 2U Rack Ears.
The rack ears replace the existing desktop side panels. You will need a 2.5MM hex head driver to remove the screws.
Remove the 4 screws from each  desktop side panel and remove the panel.
Hold the right side rack ear, the large one with a big hole, so the connectors on the MRCC align with the holes in the rack ear. Then start threading the 4 screws by hand before tightening. The screws should be snug but be careful not to over-tighten them as not to strip the holes in the enclosure.
Install the left side rack ear, then mount it in your rack!