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CWWK NAS mini-ITX motherboard features six SATA connectors, three 2.5Gbps Ethernet ports
(www.cnx-software.com)
Hosting your own services. Preferably at home and on low-power or shared hardware.
Also check out:
You are never going to get 15 Sata on a board. Just get HBA card in PCIe.
Few years ago I had a board with 10, can't find any boards with that many anymore. Ended up with one with 8 plus two expansion cards to get me to the 13 drives I have currently with 3 spare for future expansion. Replacing my old 4TB drives with 12TB drives as my media hoard expands. Upgrade feature of radarr has been a blight on my storage. ๐
You won't drive any, because pretty much nobody uses that many drives. And those who need them, use SAS.