MAYA assembly import UE4 together.
MAYA axis of normal inside
Axis of UE4 objects inside the local change
MAYA axis of normal inside
Axis of UE4 objects inside the local change
When you import as separate objects they will hold the world position of the modeling software you used (0,0,0) not their original pivot points.
There is a feature request in already for the engine to support importing object with their original pivot points intact but there is no timeline for when this will be added.