FS backup with multi stream

Hi,

I have 20 drives available, nbu 7.5.0.6
I would like to backup FS 5TB data in 1 server , sla backup = 8 hrs and restore =16 hrs.
what's the good configuration for Mpx and Stream?
4 Mpx & 8 streams , is it good for this?
any other input, please share.

Thanks