Can't find a rooting method for my tablet

Hi, I have a Samsung galaxy tab 3 from AT&T (SAMSUNG-SM-T217A 4.4.2 KOT49H.T217AUCUBNI2) and I would really love to root my device. I've heard kingo root would work for it but I've had no such luck with both the app and the windows application. If anyone could give me some insight I would be eternally grateful. My goal is to get root, get a custom recovery, and then hopefully flash some custom ROMs to it. Once again I am extremely grateful for any help anyone can give me. Thank you for your time, XDA. Also if it makes any difference its the one you can put a sim card in.