I am using the ML240R as described in the manual.
The RGB cable from the CPU cooler into the 2nd ARGB slot. The RGB from the two fans (joined with the splitter cable) into the 4th ARGB slot. Exactly like the manual says. Then powered by the USB slot. ( I don't use the SATA slot).
The Lighting Control software (ARGB_Lighting_Control_Software_v0.0.86.zip) will not let me specify 2 connections to 1 ARGB point. So I can only specify 1 of the RGB fans