Thought I might start a FAQ / KB thread while I'm rebuilding my Streaming System in the Shiny Snake / Miningeek Neo S400.
Should come with a PCIe 3.0 dual-reverse Riser cable, with a length of 200 mm (170 mm cable + connectors). Longer cables might lead to issues, as there is also no option for a GPU standoff mod, because the PCI slots are very rigid and widely spaced. Only additional modifications of the case frame itself would allow for better alignment options.
Moving the GPU into the outer 2 + 3 slot position is not a real option, as the side panel will interfere with the GPu fan shroud, even with an true dual-slot GPU.