Two barebones below use the same motherboard model (Super X9DRT-HF) per specs in your website, but one thing not clear is how a 2.5” barebone alone supports onboard SAS.
2027TR-H70RF
6027TR-HTRF
The 2008 SAS controller is on the daughter card BPN-ADP-SAS2-L6i, not on MB. That’s why only 2027TR-H70RF supports SAS.