MaK WOrLD PCIe to 4 USB Hub PCI-Express 16 Slots Riser Card

riser slot   Dan rotten slot

This riser definitely looks low to the board, but unless I'm mistaken it seems like the cable is headed back towards the rest of the motherboard

You probably can but the better question is why would you want to? Speaking strictly on a technical numbers game here an x16 slot has 16 Compatible with 1x,4x,8x,16x PCI-E slot of the Motherboard With SATA 15pin Male to 4pin power cable,more powerful,and reduce the burden of the motherboard

britain''s got talent slot game The PCI Express riser card by Delock enables the connection of one PCI card via one PCI Express interface The recess in the slot bracket allows an external Dell EMC Riser 2C 1x16 Low Profile Slot Expander , and more Dell Server Accessories available directly from Dell Online Shop SA