I agree with eyeballing it. I work at a collision shop, and the fact is there are no templates for any car that I know of to get the placement right; you have to make your own and eyeball it. I usually take pictures before hand so I can locate them properly, but if I dont have those, I hop on ebay and look for the same car to see the placement. I will also use masking tape to help me. For example to do the emblems on the back of this car, I will stretch a piece of masking tape across the back where the emblems would go, to make a straight line to reference. Then use a pencil to mark where the start of each emblem needs to go, then line them up with the tape. Using the tape makes it easier to reposition things; it is easy to move your tape and check the look of how things line up, and reposition as necessary, vs putting the emblem in the wrong spot and having to remove it and start over. I will also use other references on the car to help line it up. For example, in the above picture I can see that the edge of the nameplate lines up with the center of the clear area of the lamp above it, so I will use that as a reference to make my marks on the tape. Hope this helps. I dont think there is a right or wrong, it is whatever looks good.