The pads with the electrodes are kind of sticky.
A lot would depend on how sensitive your skin is to touch or if you have a smaller area and could place the pads around the area.

Most PT places have a TENS or some sort of E-stim equipment, I'd ask about trying one there before buying.

I think a lot of therapies are trial & error, what might help or not...
I don't recall e stim mentioned too much for RSD, but I may have missed it also.