This should suffice.
Also I bet with the 2012 cMBP the Optibay SATA connection will be SATAIII since it's Ivy Bridge. (2011 was SATAII for the optibay and SATAIII for the main port).
A word of advice...put the SSD in the main slot and install OS X on that then move the HDD to the optibay and use it a storage for large media, etc.