Dish Tv help needed

I am trying to set up a home using the two Wally’s I use with my rv. The home is wired with coax from multiple rooms going to the attic. There is also a single coax line going from the outside to the attic. It is not easy to add another coax line going from outside to the attic. I have purchased a dish 1000 satellite dish with a quad lnb to install outside to feed this single coax line that goes to the attic.

I have read goggle search on how to split dish satellite signal to two receivers but am confused by them. How do I split the dish signal to feed two Wally receivers. Thanks