Running Unraid NAS on X4

Greetings from Nubie,

I am currently interested to build my 2nd Unraid NAS, but looking for something that is even smaller than an Mini ITX board.
X4 seems to be a good possibility as it is smaller than Mini ITX board.
The challenge is of course, the number of SATA device that can be connected to the board. I am wondering whether it is possible to use M.2 M Key to 6 SATA 3.0 adapter to connect 6 HDD/SSD? The adapter use ASM1166 as controller of the board.

Many thanks

If you can handle the structure, it should work