Perhaps use open-ended PCIe x1 slots instead of PCIe x16 slots? #9

SATA card for PCIe x1 slot with 8 ports Bizarro

Expansion-Box with 4x PCIe x1 Slots and PCIe x2 Host Card, for short cards up to 20cm

pcle slot Helpful Tip: Keep in mind that an SSD is only compatible with a motherboard that supports a slot PCIe buses can support 1x, 4x, 8x, and 16x lanes

pcle x16 slot Convert PCIe x1 slot to open ended Is there a safe way to cut the closed edge? Unfortunately, most manufacturers currently produce only