At least the MKS DLC V2.1 (current production) says that it can take 24V:
The “user manual” has almost nothing in it, but the 2.0 image says only 12V, so I think @donkjr was right about the 2.0. This might in fact be the difference between V2.0 and V2.1?
If you have the V2.1, 24V should be fine.
It’s unlikely that step sticks will be sufficient for your NEMA23 stepper motors. So you will probably want to use external stepper drivers of some sort.
For a power supply, you can just add up the current requirements. It’s unlikely that your NEMA23 motors are more than 4A each; most of the inexpensive stepper drivers top out at supplying 4A. The control board barely uses any current by comparison even if it is not USB-powered; it will fit in the safety margin.
The commonly-available 350W / 14.6A 24V meanwell power supply (what I’m using) is more than sufficient if you are running 4.5A/stepper or less for your three steppers. I am running 3.2A per stepper and have four steppers, so 3.2 * 4 = 12.8A * 24V = 307.2W.