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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.
Usually happens to me when equipment stays dry for a while. I had multiple pumps do this when I kept them dry, so now even if I am not using a pump, I keep it in a bucket with water. Also if you ever cleaned it with bleach, it likely penetrated the plastic, created micro-holes, and then rust...
You are in for quiet a ride. There's no lesson to be learned here. I have 3 in my tank, one stays put, one walks sometimes, one walks non-stop. The middle one that walks sometimes, will stay put for weeks. and then move.
There's no such thing, with an open-ended question like that, you will get experiential recommendation based on people's preferences.
If you don't have a budget, look into Reef Octopus Elite INT, either 150, or 200 if you can fit it in the sump.
Not a fan of Nyos, had 120, got rid of it as soon as I could.
I was hesitant but tried Simplicity recently. Solid skimmer, without what everyone else upcharges for "space savers".