Good one on the "First Artical" test Flip. We do a lot of that here at work, but unfortunately for you, that won't happen.
Anyway, the instructions state (and I'll need to read them again) that if you are going to use the horn in wet conditions, you must put a tube on the intake nipple & route the other end where it will not "draw in" moisture, which I would assume would be detrimental to the internal workings over time, if not, immediately. I'll check to see if there is a stipulation about moisture in the horn "scoops". I'm not certain what the void design is like once up inside the horn body, but maybe it's not going to allow water in, unless you are riding through a deluge. I know there is a statement that the horn "must" remain vertical within 15 degrees any direction. Not sure why.
I do have an idea to position a "shield" in front of the trumpets, by some means, just in case I get caught out. Maybe a vinyl "wrap" with Velcro along the bottom edges. Carry it in the new "luggage compartment" to have handy in case it's needed. "Hey, that sounds like a winner". And sound travels thru vinyl real good.
If one is mounted on the left side bar, in the same manner as I have done, it would point into the radiator, but no big deal. From the front view, it would not look as intimidating as the one on the right.
Will respond a little later.