Just curious if anyone has any insight on how they go about testing multiple products
on the same audience without getting penalized for overlap.
Is it best to just test 1 product per audience at a time?
Im running a general store right now so it's not a huge issue but it seems if you
were running niche sites you would have a lot of ad's targeting the same audiences.
Depends on the size of the audience. If you're targeting a reasonably large audience you probably won't have issues unless you're trying to run multiple scaled campaigns, not just test campaigns, to the same audience.
If you can manage it , why not