Where to shoot a hog

It really depends on what you're hunting with. When I bow hunt I try to send it right behind the shoulder and do my best to not hit the should plate. If I'm rifle hunting, I'll send it between the eyes or right through the front shoulder. This is a good read on Where to aim when hog hunting that kinda says same thing
Low and forward on a pig especially with archery equipment. Most guys shoot behind the shoulder, pig jumps forward when the bow goes off and you shoot them in the guts.
If you shoot a well built arrow, heavy weight and good components you shouldn't have to worry about the "plate". That's with a fixed head of course.