ya heat rises.
pork shoulder/butt? sure, it can handle higher temps. brisket maybe closer to 260 dome? whatever you feel comfortable with.
google it, there's some reading you can do about the difference in temps on the egg between grill/dome
ideally you'd be running 2 probes into your ET-733 wireless digital thermometer- one for your grill/grate temp, and one in your meats.