All in the bay. You can let it hang or zip-tie it to the engine harness coming out of the firewall so it's hidden behind and to the side of the engine. Or you can just let it hang. My air/oil separator hides it very well so I'm just letting it hang for now.
I kind of wonder if it can be moved over to sit between the TMIC and engine, but I don't know if that's a good idea lol.