I'm bringing my meshes from the asset gym to the origin, ensuring the pivot point is where I want it, and exporting to FBX one by one. I've heard OBJ is less error prone than FBX but it isn't requested by Unreal...so here we go again on the testing of the FBX versus OBJ.
I then started importing the meshes into Unreal, so that when I update the meshes with detail and material, it will easily repopulate my scene. I'm starting to really like the look of it. Unreal import in progress below, you can see the overlapping blockout and imported individual static meshes.