You will get a variety of answers on this one. Here's mine.Conventional mount at same as deadrise works well. Velocity's from '80's always mounted at 1/2 deadrise @ 11 dergrees it works good too. If the boat rides high on the pad. Drag boat guys mount them flat like the picture. If you run in heavy water they tend to smack flat and give a stiffer ride. These I think are too close together and may interfere with water as it passes by the prop. Fountains most recently started mounting them flat but still at full width on boats that run 100 mph or more. Since then it has become trendy to mount them flat. The water only hits the outside corner of the tab and will break the cylinder on occasions. If it is to help chine walking they are not training wheels learn to drive it.