Right okay, thanks. I've found this motherboard as I'm going with the i9 9900k - https://www.asus.com/uk/Commercial-Servers-Workstations/WS-Z390-PRO/
It's the only board I can find which looks like there's a bit more spacing. Would this be a better option for two triple fan cards? I can ask the company to see if they have this board.
Could I request fans from the company? I'm getting it prebuilt, no idea how to put em in ha!
It'll be for GPU rendering in redshift, that uses both cards.