You might want to insert a gate valve on the short horizontal pipe so that you can balance the flows to the two chambers.
A sheet of plywood under the sump would help even out any irregularity in the floor under the tank and prevent the plastic frame from cutting a permanent mark into the carpet. A sheet of styrofoam insulation on top of the plywood helps even out irregularities too and also helps better insulate the sump so it does not lose too much heat to the floor, overworking your tank heater if it has one.
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