localizing multiple ARMarkers using ar_pose

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I have some general questions about ARMarkers and also the ROS wrapper, ar_pose. I searched for general information on using them in practice but couldn't find any detailed information.

1. What is the maximum number of ARMarkers that can be used in a scene at once? I'm assuming it depends on the dimensions of the markers...
2. What's the expected amount of error when localizing a marker from 5ft away?
3. What's the smallest size marker that a camera can localize 'accurately' from 5ft away? (Is there such a thing as 4cm x 4cm markers? Do they get smaller than that?)
4. How much does the accuracy improve when going from a 640x480 camera to a 2MP camera?
5. What is the average frame rate from the ar_pose node that is capable of detecting multiple armarkers? When using a 640x480 camera and a 2MP camera?

My goal is to put markers on 25 dishes or so on a tabletop and some shelves. The camera won't ever be more than 6ft away. Is that doable?

Any tips or lessons learned from experience would be appreciated.

Thank you very much in advance!