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Guns are prepositioned on three gun course except usually your sidearm. Don't really need slings there either, just gets hung on obstacles.

My opinion (you will get many) - if the shotgun is home defense only, don't use a sling, it just gets in the way. If you intend to carry the shotgun for bugout or other defensive use where it needs to allow for hand(s) free movement, it should be in front of you diagonally across your chest, barrel up, with enough sling to bring it into action quickly. As far as other long guns and how I sling carry them, I carry on my weak (left) shoulder down my back, barrel down, so that I can swing it with my left hand on forestock from underneath my arm, catch the sling on my elbow, and reconnect my right (strong) hand as I bring the rifle up. Allows for a steady shot on quick notice.