I expect that a certification agency would look at your box as a single system, and view the PFC requirement as one item.Thanks, i think two 15v open frame SMPS's which can be trimmed down to 13.5V woudl do the job...then we can knock them into a case and voila.
Thinking about one of these for the 13.5V at 6A:
and one of these for the -13.5V at 1.5A:
MORNSUN LM25-23B15 305RAC type (305VAC-input) (15-350W) Features: Power(W) 25.5, Vin(VAC) 85-305, Vin(VDC) 100-430, Vout(VDC) 15, Iout 1.7A, Efficiency(%) 86, Isolation 4000VAC, VinVACMin 85, VinVACMax 305, VinVDCMin 100, VinVDCMax 430, VoutOne 15, VoutTwo , VoutThree , VoutFour ...www.mornsun-power.com
in a metal enclosure, and add some fans in there.
And add some diodes across each output, this will give 13.5v-0-(-13.5v)
And even though its >75W, we will not have to worry about PFC?...because each PSU passes regulations on their own......so even though we have mounted them in a single box, the overall PFC drawn by that box does not matter?