I usually measure .97 PF on APW++ PSUs from Bitmain.
You can avoid almost all harmonics issues by avoiding non-resistive loads that use the neutral.
So, run all your power supplies, pumps and fans on 240V, but the coffee pot is fine on 120V.
The gen outputs 3-phase, so I have it configured to 230V L-L, 133 L-N. The 240/120 is single phase I believe?
Thanks for the responses guys, I didn't think I needed to worry about filtering but a recent conversation with a genset supplier spooked me.