The board has the Gconnector thing to make the wiring of the power/hdd led etc easy peasy.
The H110i if it has the USB cable for the link then connect that to one of the USB2.0 headers along the bottom, the cable should be long enough to go up from the H100i pump, out the rear of the case, down the back and inside the case again at the bottom of the board.
If its not long enough then place the cable behind the board (the right way around) and screw the board to the case.
So its in the space/cavity created by the standoffs.
If the H100i uses a fan header on the board for power and not just rpm sensing (some AIO use a SATA plug for power such as the H110i GT), then set that header to full speed in the BIOS and if you use the SIV software, change the fan speed for that header to fixed rpm and set to full speed.