Stereo to BIN/Atmos conversion?

I am binge watching videos about Cubase/BIN and have messed with it a bit already.

Third party plugins don’t work?
My first concern was that I wanted to transition my basic 2 bus plugin setup to a BIN version but they aren’t working (Compression for instance doesn’t affect the Center channel).

Just dipping my toes in it at the moment but looking for a good strategy.
I would only be mixing on headphones.

I know the ‘easy’ cheat is to make stems and start from that but I use 2 Bus plugs a good bit