Yes you need the acrylic top to connect the Res to the pump is the first thing, forget that its made by EK, they are all the same, EK, Laing, and Swiftech, you attach the top to the pump and then the Res to the top.
If you go for the EK Res that im using now, it kinda has the top built in, thats the black part at the bottom.
I have the Laing DDC, itcomes wth 2 x 3 pin plugs, one plug has the black and red power wires, and the other plug has a blue wire, it is only for monitoring pump speed, not controlling it, I guess you will need to make sure you buy the PWM version for that, not sure why you would want to control the speed of the pump though, they run silent anyway at full speed.