Start working yourself on it, the solution is not perfect and usually only one disk can boot an OS, others will stay as storage disks, that’s the “cost” of a cheap adapter vs BIF adapter on older chipsets.
[Guide] - How to Bifurcate a PCI-E slot - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com)
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