I think those brackets are designed to push the light bar through the grill which would require you to cut up your grill. Some people prefer that instead of hiding behind the grill but I prefer hidden to avoid cutting up my truck. I think people make brackets for hidden light bars.
OK that makes sense, ya I didn't want to cut my grill either all the light bars I've seen on Tacoma's have been behind the bumper or on top of the truck.