This room is quite tricky, since you need to coordinate four things at once (and not become lunch).
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×Snakes will tend to move towards you and if blocked, move around in cyclical patterns repeatedly. You can use this to your advantage with the Rattlesnakes to the north and east by staying near the centre of the room (hopefully they will also get themselves stuck). The one to the northeast is on a diagonal with you, however, so its behaviour will be harder to deal with, compared to the other two. I'd say that one is your main priority (along with the one in your chamber), so try to concentrate on it first (although have all the mimics placed as soon as possible, so you increase your chances of killing all the Rattlesnakes), and then focus on the others later.
You must also watch out that your relative positions don't get too far from each other, since that might cause you to waste moves getting the mimic back into the right position again.
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Resident Medic/Mycologist