No, there are not.
12-16 disk RAID is not a home user requirement nor supported widely in home user kit.
12-16 disk RAID is not even enthusiast level, it's probably past Small Business also. Those running that many disks in a RAID array should be using proper kit for it. Hint - that's not 16 disks off a motherboard.
They are using proper kits and my point is that there are some home users using more disks than me, yes its not the norm but it does happen.
If i need to expand then i will need to go proper kit too.