Maybe it has two applications and it would work, but it looks to me like that's a completely different ceiling system than we've got. The rails are the correct size for the adaptor that comes with the AP's to fit onto. The tiles just extend below the level of the rails. I've now got an AP-325 in hand and can show a picture of what I feared with the mount that's included. It pushes up the tiles so they're flush with the rails. The only way to use this mount and not have that happen would be to have to cut a rectangular hole in two adjacent ceiling tiles to make room for the ceiling mount without touching the tiles.
I like to avoid cutting tiles whenever possible because the ceilings will last for decades and the AP's are going to be replaced every 4-7 years, and each new model is a different shape using a different mounting scheme
From the documents on aruba's website, I don't think the AP-220-MNT-C2 is going to mount to this ceiling grid. Do you think I'm wrong?