I bought three 16TB Ironwolf pro's this month but they were model number ST16000NT001 which has a higher workload rate of 550 to 300 according to Seagate
IronWolf® Pro hard drives: Ultimate reliability for multi-bay RAID storage. 5-year warranty, Rescue Data, and Health Management for peace of mind.
www.seagate.com
Interestingly, I found out that Synology has a very restricted QVL for third party drives now which I knew nothing about until after purchase. They are pushing their own drives over third party one's much like other manufacturers such as Netapp, Dell etc.