I have done huge amounts of research on this, and the Omnipole system is very limited. At that height you really need a larger vac and pipe system same as I do, however it starts getting very heavy and that in itself is a big problem.
Also you need to look at how much gap you have between the gutter and the roof line. Some buildings have such a small gap that you cant get anything in there.
Just a couple of pointers.
DP