Hyperfocal distance is about getting as much as you can *acceptably* sharp. You need to decide what is acceptable. For example, if you want pixel level sharpness, that will be very different than if you were doing a small print.
The 1/3 in front, 2/3 behind is a long established myth. You get close to equal distribution of acceptable focus around the focal plane at close distances, and at greater distances the region behind will approach infinity. Sure there is some point where that applies, but you're unlikely to be on it. Having said that, as a rule of thumb, it might be close enough to be useful.
If you need depth of field, my tip would be to stop down as far as you dare if you can afford the shutter time. Just watch out for diffraction softening if taken too far.
I shoot product photography for a living and can confirm 1/3 in front, 2/3 in back is indeed quite accurate... test it when you focus on items, especially small items... live view focus it, and have items in front and in back... press the DOF button... you will see more behind the focus plane fall into focus than in front. But that's neither here or there. Stopping down, even on 5d's, beyond F11 you are introducing diffraction. F8 is a good compromise... If there is something nearer to the camera that NEEDS to be in focus, focus on that or make sure it's at the hyperfocal distance... the rest will take care of itself.