There's not much difference between conventional aircraft and canards as far as the importance of locating CG. For either, you need CG to be located so that you have static stability ( unless, for some reason, you want to fly an unstable aircraft ). The main difference is that it is very important on a canard that the foreplane stall first. There are actually fairly well defined design rules to acheive this. Generally, the airfoils of the foreplane and the main wing are selected such that the foreplane stall at a lower angle of attack. Also, the foreplane frequently has a higher aspect ratio, so that it stalls at a smaller angle of attack. The relative camber of the two surfaces can also be used.

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