Oh don't worry, after 4 or 5 hours of labor I managed to make it work with PinballY (not PinballX)
Everything is working perfectly and I don't have any problem with DMD
There is only one remaining problem and it's not a big one. It's just that I have one table on VPX and its DMD doesn't save its position.
Apparently it's just that my screens are not properly set up in windows but I can't put them on the same line because that would break PBA
It's not a big problem, I just have to manually move the DMD each time I start Metallica Pro
I just have to find pictures or videos for all my tables because atm they are all default. But hey, it's working!