Yes.
1. In the condition field of the trigger: Player in ThisList
Place 2 gamelogic object or 2 marker in the positions you
want the two shells explode and in the activation field of the trigger
camcreate the two shells
2. Same as above
3. Same as above
Perhaps is better, instead to write a long line in the condition
field, launch a little script that does it all
Hope this help.