It's been over a year since I figured this out, but it's documented very well in my past posts.
The cliff notes are, boot from win 10 install USB drive which has the windows drivers and tools on it. Start the win 10 install and step through until you get to the screen where you have the option to load storage drivers and load the raid drivers (after a few minutes of searching, it will tell you it doesn't find any supported volumes, which is true, as you haven't created a raid volume yet). Exit the windows install to the client without rebooting. At this point, you should be able to create the raid volume. Other thing I can recommend is to use drivers older than January 2016,as that's the last time I did it.
The cliff notes are, boot from win 10 install USB drive which has the windows drivers and tools on it. Start the win 10 install and step through until you get to the screen where you have the option to load storage drivers and load the raid drivers (after a few minutes of searching, it will tell you it doesn't find any supported volumes, which is true, as you haven't created a raid volume yet). Exit the windows install to the client without rebooting. At this point, you should be able to create the raid volume. Other thing I can recommend is to use drivers older than January 2016,as that's the last time I did it.