Question eGPU external video card connection

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I need to connect external RTX 3090 graphics cards to my HP workstation.

I wanted to use PCIe extension cables, but they are difficult to use since there are no external port adapters. The extension cables are not allowed to be routed through the holes drilled in the case.

Found these options:

x16 PCIE extenders

PCIe4.0 Riser cable GEN4 for GPU Ai Server smart installation high density full connecting wiring - AliExpress 7

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Lian-Li 600mm PCI-e 4.0 Riser Cable (Black) - AliExpress 7

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Lian-Li O11 Dynamic EVO XL 900MM PCI-E 4.0 Riser Cable - AliExpress 7

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MCIO 8i SFF

PCIe 4.0 x16 MCIO Graphics Card Split Extension Cable GEN4 PCI-E X16 to One-to-Two X8 Split Bifurcation Adapter Card SFF-TA-1016 - AliExpress 7

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SFF-8654 8i external ports

High performance graphics card external PCIe4.0 x16 to SlimSAS 8654 rear half-height adapter card DIY PC gaming accessories - AliExpress 44

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MCIO 8i 5.0 SFF-8654 8I to 2 MCIO SFF-8654 4I Slimline Cable with GEN5 Slimline for PC Hardware - AliExpress 7

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Top-2Port Slimsas External Card Pcie4.0 X16 Laptop To External Video Graphics Card Pcie4.0 X16 To Slimsas 8654 PC Adapter - AliExpress

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SFF-8654 8i internal ports

CEACENT CNS42PE16 Dual-port Slim SAS SFF8654 8i PCIe 3.0 x16 Adapter compatible with PCIe 4.0 - AliExpress 7

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CNS52CX16R 2-Port SlimSAS SFF-8654 8i to PCIe4.0 x16 Adapter, PCIe slot extend for PCIe Gen4.0 GPU/Network Card - AliExpress 7

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SFF-8654 8i internal ports

C-Payne PCB Design

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c-payne.com

Using adapters is beneficial because it allows you to split x16 pcie into 2x x8 ports. But the price is much higher. Who used these cards, do they work? As far as I know, they are not interchangeable. (https://watchmysys.com/blog/2024/10/gigabyte-mj11-ec1-pcie-bifurcation/)