To be honest, I ran with a set of horizontal bars for about six months, fiddling with WeakAuras to try and get something I could package like this. It works fine, but I found I had to watch it fairly carefully to get the timing on things "right", though that could easily just be a personal thing. Vertical just feels "easier" to me to catch when something's falling off at a glance, and I find it's much easier to see the sidebars for FET and the shock CD than it was when I tried it with horizontal bars.
If you really want to swap them around to horizontal, though, that's the great thing about WeakAuras. It's just a matter of flipping a few toggles and moving things where you'd like.