I'm not sure of your CA Mainframe Application Tuner release level, but there are no PTFs required for RACF support at this time at any supported level, so you should be good there.
Now, in the docops manual for CA MAT, there are security requirements for RACF.
For CA MAT 11.0:
For CA MAT 10.0:
My experience is that one is best off when following the security requirements in the manual for their specific product, no more no less.