How to center multiple objects automatically before exporting? so I have a seemingly obvious question.

I am needing to export multiple meshes in the same scene one at a time, and as they are, the meshes are placed all over the space. It seems to me that I need to move each one to (0, 0, 0), before I export them (as fbx) or else they import to Unity with the random location transforms. Is there some way that can automatically do this zeroing out process upon exporting? This way I won't have to move them one by one just before export.

This is an example of my scene :
Select all your objects then Alt+G to Clear Location (set the location to 0;0;0)