Does my M.2 SSD ports share bandwith or the lanes?

Hi, My Clevo NH58DEQ based laptop has got 2 NVME SSD ports and They are labeled as PCIe x4. I am planning to buy 2x 960 EVO Plus 1TB and Raid 0 them (It is at discount and much cheaper compared to 2TB). But I doubt if I insert 2 drives, they will work as 4x at the same time. I’d like to know whether they use the same lanes and the bandwith or not. Will I be able to run them at 2 ssd speed (or at least 1.5) or will they just work at the one drive’s speed even if they are raid 0? The schematic diagrams of the slots and the motherboard is attached. Thanks in advance.

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