I actually have two converter/chargers wired in parallel on my setup and I can use either the WF-8945 or PD9260C Charger unit by just turning on the charger that I want to be using. When I upgraded the Charger unit to a higher DC AMPs model I left the original 45AMP unit in its location in the bottom compartment of the Conevrter and then mounted the higher DC AMP model stand-alone closer to the battery bank. I have accidently left both on at the same time and didn't trip any breakers but I normally just have one on at a time...
Having them paralleled has not been a problem for me. Gives me a backup Charger unit... They are always connected and I turn on the 120VAC Circuit breaker to the one I want to use... Only the DC OUTPUT leads are paralleled...

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My PD9260C has the dual DC terminals that gave me the idea to do this...

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If there is a DC load doing this it must be a very small minimal drain...
Roy Ken