A monoblock LNB in essence is just two LNBs in one housing and a built-in diseqc switch. It will work, but dishes have different sizes, so it is impossible to tweak adjustment properly because they are one block. I have only ever used a monoblock for 13/19. Provided the dish is aligned properly, it is easy. Just clamp the correct LNB. Your response in the other thread shows a good understanding of the principles of multi-LNB setup.