Motor Stutter EMF interference from mount question

[mjp8081]

So I read a couple posts talking about how the conductivity of metal motor mounts, even aluminum, can cause EM interference with the motor and affect motor performance.

I'm looking at different materials to use as a bracket/mount--steel alloy(ferrous), aluminum(semi-ferrous/conductive) and super rigid reinforced plastic ABS(non-conductive).

How real of a problem is this? Should I choose material with this in mind, or not so much?

 

[torqueboards]

I think it should be fine. Although I haven't had an aluminum plate around my motor itself. The motor mount is aluminum.