No idea about paperless ngx but printer mfgrs generally don’t think about Linux. Instead Linux users buy some specific printers and after years of effort manage to get them working mostly usably. With a multifunction device you want the software to implement 3x the functions at the same time, which sort of cubes the difficulty. It may be even worse since the MFC is an economy product with more flakiness swept under its windows software.
I guess try web searches about the machine you are considering, but I’d be pessimistic. Consider a separate printer and scanner. Those do work if you choose good models. Basically you want commercial and industrial gear, not home office stuff.
I also think document imaging software is good enough now that for light duty use, you can get away with phone camera snaps instead of using a scanner.