Corsair XC7's RGB connector looks quite similar to those on Corsair RGB fans, and Corsair i-cue controller compatibility is claimed. So it should work with any Aquacomputer RGBpx controllers (in Quadro/Octo/D5NEXT/farbwerk360) through Splitty4. Although XC7 connector is 3-pin, meaning it does not have "data out" wired, so this block should only be connected as last device in any RGBpx LED chain.
And you cannot control motherboard LEDs with aquasuite or any aquacomputer devices.