First thing to know is that they have a very thick and tough silver skin on top, so you need to remove all of that fat and membrane or your rub won't penetrate and it won't be good eating.
I separated racks into 2 bone portions. Dry brine with salt for 12 hours or overnight, then rub with no salt bbq rub. I ran at 180 for a few hours, then bumped to 240 and cooked until it probed tender. I did not wrap and it took a total of 8 1/2 hours. I may try wrapping at some point to shorten cook time.
The pack I got had 4 racks of 4 bone each. We trimmed and seasoned all of them and of those we didn't cook, we vac sealed and froze. We'll probably do some of them BBQ, and some Sous Vide. Short ribs done SV at 130F are amazing