Think it's more of a "put it where it feels best to you" kind of thing, and likely will also vary a bit depending on what sling style you're running. Some guys run the front one way out at the end of the forearm, and I've seen others put it as close as they could to the receiver. Location for the back mount can be all over the place as well - far back on the bottom, either side just aft the receiver, on either side of a collapsible in various places via a QD pocket.
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