Hi,
Using the Creation Tools > Reference Objects >
Distribute Using: Pivot option would be the recommendable way (in FP6 Distribution > Mode:
Reference).
Also, you might find useful the "
InstancesToForest" script (it's looking in the scene for instances of the objects in Forest Pack's item list. When it finds them they're added to FP, matching the position, rotation and scale).
Hope that helps.
Best regards,