Low power NAS mainboard w IPMI?

I am looking into building a new NAS to replace my aging current one. I want to go self-built with focus on low power consumption and silence. It will run FreeBSD on bare-metal. Data disks are planned to be SSD with ZFS.

With this, I am looking for a mainboard with these properties:

• Onboard low power CPU with passive cooler (no fan)
• Min 4 SATA ports for the data SSDs
• Min 1 M.2 slot for the IS
• IPMI, this will be headless, even for initial config

Any ideas? Thanks very much!