Hmm.. this might answer, but if you need them to start at different positions, you may want to check the placement radius option....
However, If the positions are fixed, you may want to teleport them to any of the positions with a random function at init. ^^ (providing that you know the positions, use an invisiblemarker)
Wow, I did not see McGuba post
He gotta group em with markers... and yes, it works like a charm, I just tried it (after making the random script on my own lol, which works too)