two ideas:
(1) I tried this recently a few times: put a pencil dot on the reverse side of the chip at the top (and bottom?, or the sides?)....... I wasn't thrilled with the results, but maybe I was in a hurry.
(2) if you leave a sufficient space around the chip, after you scan it, you can (a) shift the orientation with the tools of Adobe photodeluxe or whatever editing thing you use, and then (b) crop the picture close to the chip so the orientation/titlting background won't show.

Robt. (I bet a slabbed chip would be easy to position on a scanner.)