It will work. LNA's 1 and two are the same spacing wise. You will need another feed horn specifically dish to get all xponders. LNA #3 use a different focal point on the dish and that focal point requires about a 2 inch spacing.
Both units an be used to everything other than HD. 2 lnb configuration:
In the two lnb configuration you can use a dish network or a direct network from either of the satellite companies.
Just remember no 3d LNB...NO HD!