Is there specifics on License Plates in MN?

I know MN is a state that requires 2 plates (as i live in MN) however i have a question about HOW said plates are displayed.

DETAILS

I have seen cars with no front bumper covers that have their front plates displayed in the Windsheild is this LEGAL display of a plate? I not too long ago saw a Ford Explorer with no front bumper cover and they had the Front plated affixed to the Grille is that considered Improper display of a plate? Also in the neighborhood in which i live in there's a El Camino that has the rear plate affixed to the rear window is THAT legal?

Very specific.

Subd. 6.Other motor vehicles.

If the motor vehicle is any kind of motor vehicle other than those provided for in subdivisions 2 to 4, one plate must be displayed on the front and one on the rear of the vehicle.
Subd. 7.Plate fastened and visible.

All plates must be (1) securely fastened so as to prevent them from swinging, (2) displayed horizontally with the identifying numbers and letters facing outward from the vehicle, and (3) mounted in the upright position. The person driving the motor vehicle shall keep the plate legible and unobstructed and free from grease, dust, or other blurring material so that the lettering is plainly visible at all times. It is unlawful to cover any assigned letters and numbers or the name of the state of origin of a license plate with any material whatever, including any clear or colorless material that affects the plate's visibility or reflectivity.

2013 Statutes
Chapter 169
Section 79