Top hole is Tuner A, bottom hole is tuner B. It does not matter which one you sue, just make sure you tell the receiver the one you are using. For sake of ease, use tuner A. You don't have to use a splitter with any unicable device if you only have one tuner unit/card.

This is the cheapest one the forum sponsor sells. It also has a legacy port (ignore that for now)
https://www.world-of-satellite.co.uk...unicable%20lnb