That’s a very small hole and the tune would need to be smaller. On my W21 it’s in an awkward spot.
I use the top filler cap. With this device on a oil jug I can stand at the bottom of the companionway and add the oil in relative comfort; looking out through the cockpit, watching the pelicans and other boats going by. It’s practically recreational. Enough to make those Zappers with their electric boats envious…
I use the fill cap.