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.