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The AMNPS would not have to be placed on the lowest rack in a Gen #2 MES,
The best place for the AMNPS in a Gen #2 (like you have) is to remove the little water pan from it's position.
Then you would set the AMNPS over the hole left where the Water pan was.
Then you put your water pan away, to keep from ever having to either wash it or cover it with foil.
Then you put a throw-away foil pan on the floor under the water pan hole to catch any drips.
Just a little info,