I think you already have your answer, but none of the current WD drives are SMR. Most are 4K, except some datacenter drives at 4TB and under, such as the WD RE, which are 512n.

I saw this at B&H. Don't know if it has shingles or it's been vaccinated against the herpes virus.
Doesn't WD still intentionally prevent you from using their drives in RAID by messing with the firmware so they'll drop from arrays? In effect forcing you to buy their RAID Edition drives?
What controller are you going to use?
Edit: Newegg has these for $225.99 after promocode ESCKNKW28 when you buy 4 or more (limit 5). Promo code expires 12/20.
Doesn't WD still intentionally prevent you from using their drives in RAID by messing with the firmware so they'll drop from arrays? In effect forcing you to buy their RAID Edition drives?
What controller are you going to use?
Edit: Newegg has these for $225.99 after promocode ESCKNKW28 when you buy 4 or more (limit 5). Promo code expires 12/20.