You can get a pcie adapter with a PLX or switch chip on the card that allows you to connect twoM2 PCIE NVME drives to one adapter if you are set on 3 of them.
I just bought a Aurora 11 and I was wondering how many m.2 PCIe adapters will fit with a 3090 set up? I want to run (3) m.2, one for OS, one for gaming, and one for photoshop.  Possible? 
Aurora 11, PCIe M.2 adapters