I use Frogmats when smoking meatloaf. Allows all that "goo" to drip out. I don't wrap the meatloaf up in a roll, just form the meatloaf in a loaf pan then flip the pan over and the formed loaf comes out onto the Frogmat. I use a quarter sheet pan, place a grill over it, place a frogmat over the grill, then place the meatloat on the Frogmat.
We devour smoked meatloaf. We like it better warmed up the next day (if we can wait that long).