The fans are controllable, but only with proper 4-pin PWM implementations. 3-pin speed control can damage the fans.
The fan controller for the case uses 3-pin speed control. It is NOT compatible with the ML series fans.
The motherboard has 2 chassis fan headers and 1 CPU fan header. All three are compatible with the ML series fans. Assuming the CPU header will not be available, you cannot safely run 6 ML series fans with your setup.
Some fan controllers do have proper 4-pin PWM implementations, and you would be able to use all 6 fans if you were to get one of those. That said, they are rare and expensive. The only one that I know of off the top of my head is the Corsair Link Commander Mini. That controller is compatible with the ML...