I used 2 MRC Reverser Units on the MWR Train Museum N Scale layout.
This is on a Digitrax system layout.
Both ends of both sections were totally isolated.
That is, 2 isolating rail joiners at each end of each section.
They worked flawlessly. No hitch or short when entering or leaving the section.
They were connected directly to the DCC Buss.
It is interesting that you can't get it to work.
That was my 1st time using a reverser.
They are still working 5 years later.