the 1x->16x usb riser is the best option, and sould work in 90%+ of motherboards
ps: avoid MSI mobos, particularly the "killer LAN" ones, as they require abnormal drivers tat are a PITA
Ok
Can I put that small 16x:1x riser into the full size 16x PCI slot? Will it work properly?
yes, you can you don't need the x16 x16 riser, but the performance may suffer when attached to the monitor