There should be a front bottom bumper that covers most of that stuff (horns, etc). Even with the bottom half, you can still see some of the horns.
On the fender trim, assuming you got the chrome??? I had that one mine, 3 out of the 4 fit great - one didn't. I sent it back and they sent another one that fit a whole lot better - but not perfectly.
I don't think MBZ offers fender trim???