I have also read it often, – some people who have paroes seem to have experience with them jumping, however I also never do anything to avoid it, and only once (in maybe 200 fish) have I found one dead on the floor, obviously it had jumped. But I never take particularly care of it, – I always have cover glas, but with holes for feeding, and at times I leave the glass half off, or all of.
As with all fish, of course I would never have an open tank if the water level is all the way up, – and I would recommend a cover glas also. But I dont experience parosphromenus as particularly in risk of jumping more than most other fish.