...
I have the same configuration, also mixed on the same rack devices with "-" and "+", and all work as expected, without short-circuits,
because both the AC and DC power sources are galvanically isolated
I didn't, I missed that in the description somehow... "Simply remove one of the current power supplies..."; implying that mixing them is ok.It show's that combination in the brochure, and even mentions that specific combination in the product description. Did you try it and are having problems?