There are more reasons to it ranging from multiple customers / entities & networks to specific computer and device naming conventions + security concerns. But the main reson is that I saw Fusion Inventory import some time ago and decided to use manual evidence instead. At that time it was much faster than handling mess FI created. Maybe I would give it another try on the right occasion.

Cool. So when we add unique UUID to a Computer and to the VM they become linked. A little bit complicated due to manual UUID creation but will do the trick. Thank you Walid Nouh.

Not a very best solution but as long as it's linked from both sides it could work. After all I have VMs as Computers at this moment so it would be easy to link them to some host computer when possible.