It’s super easy to just select everything before exporting and then set their positions to 0,0,0
Then when it imports to UE4 it will have the pivot in the position you want.
Now as far as actually putting the object where you had it in , that’s a different matter. Since things are imported to the content browser where they can then be dragged and placed in the level, that position isn’t something that’s easy to export. There’s tools in the Content section here on the forums to help place objects into a map the way you have them in , but it’s something that’s outside of the FBX exporter.
Ultimately what UE4 would need is a way to import a collection of objects as a Prefab object, so you’d get each individual object into the content browser like normal, but it would also have a prefab where it’s a collection of all those objects together in the positions that you want with all the correct references to the individual objects in the content browser. Maybe we’ll get something like that at some point.