15 R2, M.2 compatibility matrix

Hi,

I have an Alienware 15 R2 laptop which i purchased new a few years back, it has an Core i7-6700HQ processor and 16GB RAM.

it is currently running Windows 10 Home and i want to rebuild it as dual boot and install everything from scratch. it has 3 drives in it which are:

1 x 256GB Liteon 2260 M.2
1 x 256GB Samsung EVO Pro SSD
1 x SanDisk X110 M.2 2260 128GB

Before i open it up to check i want to confirm that this laptop is compatible with: 

Intel 660p Series M.2 2280 1TB PCI-Express 3.0 x4 3D NAND Internal Solid State Drive (SSD)

As i have purchased 2 of these above mentioned M.2 sticks and can i have an all M.2 (3 sticks) laptop?

Thanks

Mark S.