Lip Splitter for Cup Spoilers?

I'm looking for a lip splitter to fit with cup spoilers. I'm buying more to protect the spoilers and the rest of the front from stones than for aerodynamics, so is there anything that'll follow the contours of the front of the car with the cups fitted? I'm sure I saw something on this site not long ago, a lip that went up in the centre? If not, then what's the best regular lip splitter for cup spoilers, something that's not too prominent?