Installed off of my dual Bell LNB. Had a hard time getting signal. I finally got signals for the two receivers I already had (had to run numerous check switches and tests) . Worked well for a few hours then kept losing signal tried numerous fixes (loose coax connections etc.). Went back to straight feed from LNB and everything good.
I suggest you just buy a quad LNB if your dish setup allows (which I did) and forget about a multi-switch.