That motherboard has giant M.2 heatsinks which are also double sided. If you needed additional cooling I'd be really concerned as it's a good cooling solution. Many motherboards do not have something anywhere near that good.
I thought the cooling onboard was kinda standard for mid to high end range boards. Maybe the double sided cooling is something unique on paper, but I can tell you it's nothing in reality! There is literally nothing under the drives that make any contact! The board is very thick and heavy though, so that's what they are probably claiming as double sided cooling. The board itself does have a copper layer in it's multi-layer design if memory serves. I like the board, I'd buy it again, but I don't know if it's really worth the $400 I paid for it.