I'm pretty sure a flounder won't jump....unless your putting it in your frying pan! Seriously the only thing that I've had that doesn't jump is my watchman's goby.
Oh yeah she's jumped!! I've caught her 3 times, wifey had to scoop her back in once. But after about a month she's calmed down... Haven't had an incident in a while, now that she's got her cave!
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Wrasses are a group that are more prone to jumping. I think it has something to do with their threat response, swim really fast in the least threatening direction, which sometimes happens to be out of the tank.
The key, IMO (which means nothing), is to have a tank full of peacefully cohabiting fishes. Basically no stress=no jumping.