NFA Trust Fingerprint Question

[HH67]

All my NFA items were done on a trust prior to having to submit fingerprints.
So, here is my question:
If I were to efile form one on several guns (sbs,sbr), do I have to submit fingerprints for each form 1 or just one time?
Thanks

 

[Gunsite Grad]

Following

 

[Dave550]

In

 

[alleycat]

One set for each one