Synology RackStation RS3621XS+ 12-Bay 3.5" Diskless 4xGbE NAS ,Intel Xeon D-1541,2.1GHz, 8GB DDR4 RAM, 2xUSB3.2, Synology Compatible drives only.
Synology Expansion Unit RX1217 12-Bay 3.5" Diskless NAS (2U Rack) (SMB/ENT) for Scalable NAS Models
Synology Expansion Unit RX1217RP 12-Bay 3.5" Diskless NAS (2U Rack) (SMB/ENT) for Scalable NAS Models RS3617 ( With Redundant Power Supply)
Synology RackStation RS819 4-Bay 3.5" Diskless 2xGbE NAS (1U Rack) (HMB), Realtek RTD1296 quad-core, 2GB RAM, 2xUSB3, eSATA x1,Scalable