Yes, this will be easy. Your mobo has three SYS_FAN headers for case ventilation fans. Unless you have more, simply plug each of your SP120 RGG fans' MOTOR cables into one of those mobo headers. If you have more than 3, post back here for hints on using a Splitter. Then see p. 22 of your mobo manual where it says to access BIOS Setup, you should press (I say, hold down) the "Del" key as the system first starts to boot up, until you see the opening screen of Setup (p. 23). From the top menu choose "Smart Fan" at bottom right and see p. 26-27. For EACH of the mobo SYS_FAN headers you are using, select that header and set as follows:
Fan Speed Control "Normal"
Fan Use Temperature Input "Motherboard" (not CPU)
Fan Control Mode "Voltage"...