well seven tattoos,,,,that is alot
!don't admit all of them you might scare them....just kidding!but you were wise to put in places where they are not visible with uniform,for the shoulder,I suggest you declare although its not visible.
I do have tattoos but one is visible which am already removing(will not declare I have it-on my arm near my wrist) and the other on my shoulder,will declare that one only!good luck!