Even if you could place a fence there it wouldn’t help.
See the bottom of this post:
The easiest fix and probably the best as well, would be to replace double jump with something else and simply make it impossible to do. Im not even sure that sloped fences would work against it.
The wedge foundations are actually very nice and a good design, the moment you figure out how to use them correctly. I, as many others I guess, is pretty confused about them in the beginning. But now I think they are genius 