You would be better with a dual output LNB as you will get the horizontal/vertical conflict ( both boxes will have to be on one polarity or another , example you cannot watch Fox8 on one and Imparja or Box Office on the other at the same time. All Aurora and all Fox Box office ( and probably some I havent thought of ) are on Vertical polarity.
For the price of a dual output LNB and a bit of RG6 and connectors , you would better off doing it properly in my opinion.
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