I'll cut up some taters into 1' cubes and put some butter, garlic,salt, and pepper in a foil pouch with them. I'll use zone 2 and place them there when i start warming up the grill. It takes them about 1 hour to cook, I cook at 300*(turn a couple times). You can grill chicken, hamburgers, steaks,etc. on zone 1 then....just add them when you need to start cooking to finish about the same time.
If the taters are done early, throw them in the warming drawer.