Meatloaf and a Brisket Flat
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I smoke meatloaf all the time and will not have it any other way. I have found that putting the meatloaf on parchment paper works the best, you can also use a bradley rack.
IMHO I would start the flat early and add the meatloaf when you wrap (assuming you plan to wrap the flat). The meatloaf can finish while the flat rests.
Good luck and Smoke ON!
It looks good! Glad to hear the meatloaf turned out great. Brisket takes a long time, tell us how you did it and maybe we can figure out why it came out tough. Under cooking and cooking at too high of a temp are typically the reason a brisket comes out "tough".