Good idea, As I have 3 boxes, I would only have to elevate the middle one, allowing the side boxes to interface with the upward pointed side of the cable. So not bad. I will consider those cables mentioned by others that can be ordered with the angle where you want it, however I think it would be over $60 with shipping, a bit pricey. I think I will try your idea for now unless somebody comes up with a more attractive (and equally cheap) option.
