Paul,
So I am correct in the belief that these are anchor bridles?

If I understand your post correctly - the snap would go to the eye on the float bow, the anchor line would go through one of the two carabiners (depending on the angle I want to set to the wind), and the anchor line would then be cleated off as normal to the deck?

I'm guessing the fact that I have two is either just for backup, or both can be rigged to the floats ready to use for whichever way I want to orient the boat to the wind (without having to take one off and move it to the other side...)?