When Rhino exports a .obj file it creates just a point cloud - no polygons and only half the object, when this .obj file is opened on Modo.
However if the file is exported as a .lwo file it opens ok in Modo
Can you send us the 3dm files. We can take a look and see if we can fix the problem. You can attach it here, or email it to us at tech@mcneel.com