There are no product-specifc co-residency requirements for UCCX on UCS.
You must, however, still follow the general co-residency guidelines to be supported and to help ensure optimal performance:
http://docwiki.cisco.com/wiki/Unified_Communications_Virtualization_Sizing_Guidelines#Application_Co-residency_Support_and_Server.2FStorage_Selection
That particular section of that page describes all the co-residency requirements.
As there are no product-specific requirements for UCCX, the second, third, and fourth bold bullet points and sub-bullets will be the most relevant information to you.