Cam plate question?

Your engine, after it's installed has a rearwards tilt of several degrees. As far as I know, liquids do not generally flow uphill. So how the oil gets onto that driptab is a mystery to me. And even if it does get on there and drip, what happens in a running engine? I'm trying to imagine how that drip tab works with oil supposedly coming thru the bolt, or down the driver's side edge.
What's on the back of that plate?
Ima thinking the oil supply comes from the front cam journal, or the lifter gallery.