In my opinion, there’s no such thing as too much of a safety. I’m applying to an open admissions school that I can attend for free because my mom works there. 
Worst case scenario, I’ll attend, try to get into the honors program, and then transfer out after a year or two.
I think “super safeties” are smart because they’re more likely to offer bigger merit scholarships. Plus, some people get waitlisted, even at their safeties. Best to have a school you’re confident you will be able to attend.
And another note - I think it’s almost better to go to a safety school if you plan on going to grad school, because a) you don’t want to put yourself in debt, and b) you don’t want to burn yourself out.
Again, this is all just my opinion. I’m also a high school student so I know as little as you.