Take a look at the orange car, it has a round plug higher up and to the passenger side in the bumper cover, that is the stock tow ring point.
I wish are cars came with that, front and rear, I have bought new plugs, drilled a hole in the middle and screwed in custom rings. The use of the drilled cover, on the front of the car, is to block air from going in behind the bumper cover, a bit more aerodynamic than just leaving off the cover.