Thanks Bill for the pictures.
So CR AC condenser can be used in both horizontal installation, but obviously having always the gas side on the upper connector.
Probably the flexibility in installation has been the reason for opting to have even split, this gives more options for putting this into the car and probably having uneven split would have gained only very little. This is also the reason not to mark one of the connections as input.
I'm still wondering how much performance would be lost in vertical installation versus horizontal.
In my case horizontal installation needs 1.8m longers hoses than the vertical installation (rear wheelwell).
Would this 1.8m of extra hose lenght lose more performance than the vertical installation?