Most tire manufacturers still put a yellow paint mark on the tire that is supposed to be aligned with the valve stem. This is the lightest part of the tire. That said, most tire INSTALLERS(I won't call them all techs) are doing an entry level job, that no one else wants to do, and they just mount the tires with the mark wherever it ends up. This usually means that they have to use excessive weight to balance a tire. Here is a link from Yokohama but other tire manufacturers use the same standard. Just scroll down to "weight method".
Tire balancing