19/20 Pin 1 to 2 Y Splitter Internal Extension Adapter DIY USB 3.0 Header Cable
You can use USB 3.0 type-A female convert USB3.0 (20pin Header) directly connected to the motherboard. USB 3.0 port switch to USB 3.0 19 pin/20pin cable.there are screw mount holes at USB 3.0 female end.