Jer,
Since maid okay, shld be okay. Maid tend to be ya ya abit but as long dun create "outside" problems, it is the best.
Like I mention, I intend to use the 1st 2 layers. 3rd layer empty, unless I want to steam rice or something. So technically, no holes when I sterilizing the bottle. Also need the hole to let steam out mah.
Even if u use normal sterilizer, you also have to open and close the sterilizer often (i.e. every 2-3 hrs). So for me, using this steamer, maybe can steam more often instead and more bottles but open and close taking different tier bottles at one time. =)