Well according to the SNS reps, they recommend up to three times a day (as you suggested), 30 minutes prior to meals.
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If you're doing any sort of fasted cardio I would definitely take a dose prior to that and dose your other two servings with your main meals.
On resistance training days, I don't think RK provides any sort of 'stimulant' effect so taking it prior to training wouldn't matter (although it might make you use more fat during training), so just dose it with your main meals.