Ok, so I checked all the info here. I reject the M2 sata card based on the @IG-88 feedback and in addition, I saw that motherboard disable the onboard sata_1 port if M2 port is used for storage.
So I have 2 Pcie 1x 3.0 and the graphic slot Pcie 16x 3.0 available. I just need 4 more Sata ports, so, one option will be using 2 cards 1x, with 2 ports each one. Or find a 4x card, with 4 sata ports using the 16x port but I think this is not possible.
I know the initial question is solved and I marked like that but if you have any advice about this I would appreciate it.