3 dots should mean 3' toe in the rear of the rear toe block (also known a RR). This will give you 3' total, if you are running 0' rear hubs.
The front of the rear toe block (also know as RF block) should have no markings, as it is the pivot point for where the rear toe is measured.
Hope this helps sort things out. Remember , put aw grease on the suspension shafts before they go into the toe blocks!