The plate ribs can handle heat, much like a brisket can. There is a lot of internal collagen that needs to be rendered down. Go with your favorite brisket rub. I like to cook my brisket north of 275 degress, but I am using an offset or my drums. I am looking for color and bark, which will get there in about 3 or 4 hours and the meat would be around 155 degrees of so. I would then wrap and take them to probe tender which would be around 205 to 210 internal. Then give them an hour rest or so in my cambro or a dry cooler if you don’t have a cambro.