I searched and found your floor plan which different from mine as my washer-dryer is in the bedroom on the left front corner. Anyway I would leery to quote any measurements even I had the same model.
This is how I would proceed. Pick a spot in far back corner of the Dryer Cabinet lower than the Dryer outlet. (lower to allow accumulated moisture to run to the outside). Make some measurement to see where the vent may appear on the outside. Now proceed slowly and drill a hole from the inside towards the outside, no more 1/4 inch in diameter and no deeper than the wall wood ( 3/16 inch ?). this should provide a peek hole and a place to stick a small screw driver, wire, dowel rod or whatever in to determine where structural frame and sewer pipe is located. My finding is most all the time there lots if slack to move wires and water pipes and my guess is your electrical and pumping would not be lower than the bathroom floor. If successful enlarge the hole and drill the outside last.
Secret always do your survey hole where it can be patched and not noticed and the little will be happy.
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Clay
Illinois Northwest
Montana 3455SA
2011 Ford F350 6.7 DRW CC LB
Previously had E350 Class C
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