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Noooo please don’t drill anything.
I had mine also on a doser. I ran a line through one of the air holes in the cup, down into the cup, then up into the neck and down into the body. LC was dosed right into the skimmer body where the water / air exchange happens.
If I can make a recommendation, at least what worked for me, dose it right into the skimmer. That way any precipitation should be instantly skimmed out.