Found this macropad on Aliexpress and decided to go with the 6 keys version, allows me to customize even the knob actions, and after finding this model for the 3 keys version I wanted something similar but trying to keep the cable on the back.

For this version I kept it horizontal to avoid having issues with the space and the angles (still a newie on the design part). 

For the back plate supports are needed, the default is 10% infill, it prints ok at 0.2mm but the 3mf file has a setting of 0.15mm to have better results.