OP's pic:
I was driving in the rain on a two-lane road a few days ago. I saw a Ford truck with this sort of stance and the spray off the face of the wheel was minimal, but there was a decided jet coming out of the open top. This would suppress that.
Also, where most of the big rigs punched a small hole in the air, I met one that had spray three lanes wide — his, mine and the ditch. It was past by the time I wondered what sort of setup it was.