It has been my experience that it is quite rare for starters to stay after practice and sign a bunch of autographs. A guy like Shady might stop to sign one or two, or take a quick picture, but then quickly into the locker room. You’ll have better luck getting autographs from rookies and/or lesser known guys.
Also, you have to fight through a crowd of middle aged men, who seemingly are looking to get autographs to sell on eBay or something. I “had words” with a guy who kept nudging my 7 year old son to the side, so he could reach over top of him to get his “glossy photos” closer to Charles Clay, Preston Brown, and Tyrod. I’ve found that the best place to get autographs is on the fence just to the right of the large bleachers. Get there 10-15 minutes prior to the final horn, and stay right on the fence.
It’s really hit or miss, but I’ve found that we’ve been more likely to get autographs at the night sessions. FWIW.