1. It will always splash.
Re deckplates: some faucets can be installed with or without a deckplate. I bought a Moen kitchen faucet that came with a deckplate, but we decided it'd look better without one. I called Moen, and they sent me the standalone handheld spray base at no charge. We eliminated the deckplate and put a soap dispenser in the now-uncovered 3rd hole. I suspect that if I had originally bought the no-deckplate version, they would have sent me a deckplate if I changed my mind the other way.