What do we know about AC condensers and mounting orientation?

Starting to lose my mind figuring out the AC on the Molvo.

Since for reasons beyond me, AC fittings and parts with metric fittings are not really a thing, I am looking at not using the Miata condenser.  Shame cause it would have made this easy.

I do have a brand new condenser from Vintage Air that will fit if I tip it on its side. However, I notice that all the listings for condensers list them as a "top" and "bottom fittings with the top fitting always being to larger -8 from the pump going into the condenser and the smaller -6 exiting at the bottom into the dryer. If I roll the unit on the side, both the fittings will be either on the top or the bottom.

Anyone privy to any AC theory where the fittings on a AC condenser must be located top and bottom?

Since the condenser condenses, the refrigerant comes in as a gas and condenses into a liquid when cooled for the exit, so the exit needs to be lower than the entrance.

From what I have read / seen, you can lay them pretty flat, but you will need to give it a bit of a rake to keep the exit lower.   You want to put it on it's side which should work the same way, just keep the exit a bit lower.

Another reason they're orientation-sensitive is that it matters where the lubricant pools.

Off the top of my head, it has to do with oil and liquid flow through the condenser. 

Both fittings on the top or bottom, the condenser fills with oil and loses efficiency and possibly starves the compressor for oil. 

You also don't want the gas entering the condenser to have to push the liquid out of the top of the condenser. 

When installing a parallel flow condenser, the tanks should be vertical, and the tubes horizontal. It is also critical that the gaseous refrigerant pumped from the compressor (the larger #8 fitting) be on top, and the liquid line (smaller #6 fitting) on the bottom. As a gas is being condensed into a liquid, the system will work more efficiently if it's not trying to push a liquid up through the condenser.

The hive provides once again. Thank you all for dashing my hopes. I am now smarter ( better informed?) than when I woke up.