gateway contribution = 3% SH + 2% PS. Does PS have to be 100% vested?

My title kind of asks my question:  If we have a cross-tested safe harbor plan (3% SH).  We want the owner to receive 15% of pay total ER contribution (3% SH + 12% PS) and everyone else to receive 5% (3% SH + 2% PS).  Does the PS portion of the contribution have to be 100% vested?  

Thanks

No, the 2% PS piece does not have to be 100% vested.

by the way, if that 2% had to be a QNEC as well, you wouldn't be able to impute disparity on any of the NHCE contribution when testing!

Thank you both.  I wasn't aware of the QNEC point that Tom brought up.