I didn't want install the power supply outside the printer, so I put the power supply inside the printer and I made this power plate. You can fix it on the 2020 profile. It is fixed to the same profile by two M4 screws in the front and two M4 from the bottom. Because it has to have high rigidity when plug the power cable, its height must have the distance from the profile to the floor, to keep itself unmovable. It was printed with layer 0.3mm and infill 50%

If you need modify it, I am addind the solidworks file too. Please, don't forget show us the results when you make it

UPDATE 2018-03-10 I added a new STL file. Its hole for the inlet connector is 20x27.5mm