Velka 5 Upside Down Legs
thingiverse
Print 3 of the normal legs and 1 GPU bracket leg. The single leg has a tolerance cut into it so that it won't stick out further due to the GPU bracket on the Velka 5. This prevents wobbling. I would highly recommend getting some right angle connectors to use when used in this orientation. A hole cut into your desk would also work.
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