Free advice if you take a 3 foot level and place it against the side wall of your tire top to bottom and use a smart level to make sure it's 90 degrees then place it on the edge it will tell you your camber instantly and you don't need to put anything on the hub and if you get a straight edge and place it on the flat surface of the spindle top and make sure it's pointed straight ahead you'll get your caster.
And if you build the caster into the upper a arm mount you'll never have to check caster again! Old school works and it's cheaper.