3D PDFs are quite rare, and I've never actually viewed one, even though I work with PDFs all the time.
However, I'm certain that InDesign has no concept of 3D artwork. Most images are not embedded but are linked.
For these reasons, I think it would impossible for you to place it and export it, preserving the 3D.
Guess I'll have to try it. I may have to insert a real URL to a 3D object if embedding does not work.
One can only attach a 3D PDF to a PDF document in Acrobat.