It kinda depends on the seating arrangement you come up with; generally speaking, to be ridable your pegs need to be more or less under your sack......being the center of gravity, and high enough not to drag but low enough that you're not sitting on your heals.
On mine, being the RH it's already got "factory rearsets" but that really puts them in a standard position...albeit rear-set from a regular virago. However I need my pegs up 2 and back three. My plan is to machine new plates to suit, bolting to the engine and in my case also providing an extra anchor point for the CBR swingarm I have for this silly thing.
You might check fleabay for some RH peg mounts($$$) to start with though I'd be happy to machine some for you too...