For 2 bladers I use the KME. For 3 bladers I free hand them. When I use the KME on 2 bladers I dont use the wheel contraption, instead I just hold he jaws in my hand (and the head is in the jaws) and free hand that.
Regardless of 2 or 3 blade my sharpening medium is sandpaper. I am relatively new to sharpening and I find sandpaper to be easier to work with than stones. I just take an 8X11 sheet of sand paper and place it on top of a piece of plate glass and start sharpening. This process takes time but its foolproof.
I have 150, 180, 220, 240, 280, 320, 360, 400, 500, 600, 800, 1000, 1500, 2000, 2500 and 3000 grit paper and use whichever ones are needed dependending on broadhead condition.
Good luck.