I believe this is between the Bl 10 points? I never actually hit anyone in Bl 10 or the cervical spine between. I touch/Contact only without a hit for practice. Too dangerous. It comes up in kata type moves for a downward elbow or other downward strike, I know this is a target. I wouldn't hit it unless my life depended on it. Since I don't actually practice it, I wouldn't know, but I suspect one problem with it is that if you miss, you get the skull and that can take the hit pretty well. You aim and intent need to be "dead" on. It comes up in a kata "Circle of the Panter" where the downward elbow is followed by a rotational neck break, then face throw to the floor.
Peace in your journey.
The older I get, the better I was!