The design I’m using is wattles raidfarm link for the YouTube video: https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://m.youtube.com/watch%3Fv%3Dz2LF60N9f0o&ved=2ahUKEwip2c6ow_iGAxUc6zgGHUlDCtgQz40FegQIDRAq&usg=AOvVaw1p_cKOHDg-dl7aOh9Z5EdR
I don’t think you can stop then from spawning, but a bunch of boats can effectively capture them until they despawn. I’ve seen a more complicated raid farm design that uses them to help them off of afk players in the kill box.
This is how I handled them in my last raId farm.