Where on the tire do you put the venting hole(s)?

OK, I read the STICKY Tire glueing 101. According to guys responding there, inside tires don't need to be vented in the tire since there is not alot of loose dirt from the clay tracks.
I just thought there was some difference in performance of the tire with venting in the tire instead of/in addition to the wheel.
If it doesnt make a difference, I wont worry about it.

Thanks