I'd use a ribbon. If I had a board/CPU like that I would want to show off my GPU/s.
TBH this sort of thing is not for us nor aimed at us really. Epyc is their new Opteron, and it was very rare that people used Optys in desktop builds unless it was ridiculous like the 140 was it? 90% overclock on air
I'm definitely concerned about the bottom ram placement there, If this motherboard had a normal motherboard layout, this wouldn't be an issue, although I'm no server expert, so perhaps there is some international standard as to why the layout is like this. The socket size probably doesn't help.
Why is everyone so concerned about the DIMM/PCIe slots placement? Server/Workstation builds rarely employ multiple video cards. The bottom-most PCIe slot is free from all obstructions and the rest can be filled with SSDs/LAN-cards/etc. If you want multi-VGA you will get risers or get another board altogether. Remember this is niche not enthusiast/consumer product.
Why is everyone so concerned about the DIMM/PCIe slots placement? Server/Workstation builds rarely employ multiple video cards. The bottom-most PCIe slot is free from all obstructions and the rest can be filled with SSDs/LAN-cards/etc. If you want multi-VGA you will get risers or get another board altogether. Remember this is niche not enthusiast/consumer product.