I was going to suggest all the stuff below, and had it typed out, until I found this:
It just might fit under your card. Otherwise...
What model of motherboard is that? Perhaps there is a low profile, full cover waterblock that has connectors positioned away from that area. Like this:
They are low profile and might fit under the card.
Or, and this would require extensive modification and/or a special case, you could get a PCIE riser board
Or, if there is a third PCI-E slot at the bottom of your board you could try it, but you will likely only be running at 8x.