As for where---They're all different:
Gen #1 MES 30 & MES 40 goes on the bars to left of chip burner assembly.
Ge #2 gets the water pan removed & it goes over the hole left by the water pan.
Ge #2.5-----Not sure where yet. Maybe on top of the water pan (No water of course!!), or if need be, on the bottom grill rack.
I can't really say on the Beef Sticks----All I really cared about was getting 10 pounds in (my normal batch), and I can get that in, without using the bottom rack, with room to spare.
I don't have to cut rib racks in half, or a normal Brisket, and a whole lot of times I can get everything I want to smoke on one rack instead of two, or on two racks instead of three. This makes my Dishwasher very happy!!