Yep the 1x riser into the 16x slot.
You can disable onboard graphics and plug monitor into the graphics card connected to the 16x slot.
you can mine with however many PCIe slots you have 16x and 1x.
Just monitor power draw on the PSU!
Looked at the pic again, I only see 1 x 16 and 5 x 1 PCI Slots?