The offline controller that came with my 3018 Pro CNC from Vevor Australia is quite a bit longer than most of the other offline controllers. It also had an acrylic back plate that was also longer and the holes didn't line up to any possible mounting points. I also didn't have any M3 screws the correct length so I just made a little slot for it to fit. it just slides on to the right side extrusion, you'll need to remove the front plate though.