In more than 50 years of whitetail hunting I've shot them while sitting on the ground, leaning against a tree, from tree stands and box blinds. All have worked when hunting where the deer are, only shot one buck when the rut was hottest. He had his nose to the ground tracking the scent of does that had walked thru earlier. Nothing else seemed to matter to him although he did occasionally check the air above ground level. Last time he put his nose in the air I let him have a 12ga slug square in the chest, he was a DRT.