I have a MES30 and use the AMPs, I do mine slightly different but its what I find to work the best. Most folks will say set it in the lower left corner on the two stabization rods. Its a dang tight fit ib mine. This means you've blocked one soide off against the wall already. Also best place to reamin in the air draft thru the unit is between the airs suction and the discharge. Mine is a gen1 unit abd the air in is the lower right and the air out is the upper right. The AMPs in the lower left is as far as you can get from the circulation.
What I do since I seldom ever use all the racks is, I position a rack right on top of the smoke box. Its not stationary or held in place so you must use your head to keep it from tipping over. You'll do it once, as I did, but then you pretty much remember.
Traditional lower left corner
Where mine works best. on top the fire box, it has 100% cirrculation and is right in the air draft.
Also I learned it worked much better not trying to over fill the tray, 1/4 inch from the top forsome reason for me starts and smokes better.
Then if you'll barely crack the re-load tube so it can get better air flow,
Vent full open, you need that air flow to start up. then once you've established a good smoke you can adjust the vent to your preference.
After numerous uses I always check and clean my AMPs with a wire brush because from the burn it can plug some of the lower airways and the wire brush makes fast work of them.
Hope that helps some.
remember to enjoy the smoke and Bon Chance!