The Borg don't really stay stationed on planets, the Star Trek universe has FTL scanning technology, and as a general rule, physical projectiles are handwaved t

The Borg don't really stay stationed on planets, the Star Trek universe has FTL scanning technology, and as a general rule, physical projectiles are handwaved to be unable to penetrate shields on ships, and even if they didn't, that's exactly what the deflector is for. Sorry you got downvoted though.