In most states it is illegal to drive with more than 4 lights on (2 headlights and 2 fog lights) and the fogs need to be below the headlights. Some states even have stricter laws on the placement and height of the fogs as mentioned above.
If you are looking to add fogs, go with yellow in the lower grill. This way you have your choice of the factory white fogs or the after market yellow fogs depending on the weather.
If you are looking to add driving lights for off-road use, the uppper grill is the best location since you will get the widest beam spread there as opposed to putting them low.
Before just adding lights to add lights, you need to know where and when you will use them because that decides the type of light to get, driving lights or fog lights.