Resizing and repositioning obj files when importing

I'm a total PS novice so apologies if this question is basic but I can't seem to find an answer anywhere on the forum.

I'm trying to import several obj files from the bodyparts3d website.  I'm doing this by going to 3D>New 3D layer from file.  Unfortunately the objects are imported without the correct scale and relative position to each other that they had in the original web app where I exported them from.  They are all appearing centred in the canvas and taking up most of the canvas size.  I tried unchecking "resize image during place" in the general preferences but that didn't work.

If I use Cheetah3D and set the 'import scale factor' to 1.0 they are positioned correctly in that application so I'm sure the original file must contain the necessary data but I just can't make it work in photoshop.

I don't know whether this is something very straightforward to do or whether its a fairly advanced thing so would appreciate any ideas or advice.

Many thanks