WIth any kind of advanced software you will never be getting drive speed out of a soulution.
Raw nvmes can hit 800k iops. Add XFS and you may be able to get that.
with MDADM you get like 200-300k
ZFS shrink it to 20-50k
Anything network be glad if you get 5-20k
The more software is involved the worse performance gets especially for IO. Sequentials often scale better or even linearly, but IO is a PITA
86W so about 20Euro/Month