Stereo effects pedals between two Mixing Links?

Has anyone tried this? Essentially, I would like to run the FX sends of both MLs into the left/right inputs of a stereo effects pedal, with the left/right outputs returning to the respective FX returns. Also, I may desire to use not just one but several stereo pedals in this manner. I am very much interested in purchasing two of these Eventide boxes for this application, however I am concerned about ground hum issues resulting from such use. Would it be necessary for me to include isolation transformers within the loop (e.g., Ebtech’s Hum Eliminator)? (My plan is to power all of my pedals using two SurgeX power conditioners on a single outlet/circuit — two sockets, no daisy chaining — and with each effect using it’s own dedicated wall wart…thus I surmise that my signal should be relatively clean otherwise, at least that is what I am hoping.)  

I apologize for asking such a rookie question. I’m only now beginning to get OTB and into the world of stompboxes. Any advice or help in this endeavor would be greatly appreciated.