storage - ZFS stripe on top of hardware RAID 6. What could possibly go wrong?

I have 36*4TB HDD SAN Rack. RAID controller did not support RAID60 and not more than 16 HDDs in one RAID group. So I decided to make 2 RAID6 groups of 16HDD or 4 of 8 HDDs.
I want to get all storage as one partition.

So, what could possibly go wrong if I will use zfs pool on top of hardware RAID6?
Yeah, I know that it is strongly recommended to use native HDDs or pass-through mode. But I have not this option.

Or should I stay away from ZFS and software raids in this situation? (I'm mostly interested in compression and snapshots)