As a comment, sent a message to the eBay seller of those rubberized metal brackets to check if they work on a 2015, and he was going to check that at his dealer. From his pictures, it seems my 2015 grab mounts where those brackets latch, are different. Mainly requiring longer brackets. When he replies back, I'd post his answer. Mine seem pretty sturdy, but will probably buy them for added piece of mind.
My question is in case of a low-side, are we and the bike better or worse off with the bags piinned/bracketed? If they don't detach (a big 'if'), we (our legs) might be better off. But don't know about the bike's damage.