PaulS:
In order to connect sensors to the board i would need to solder or use a breadboard right?
No, but a breadboard makes the wiring a lot neater.
But would i need also one receiver unit on the laptop side per accelerometer?
Draw yourself a picture. There are 6 accelerometers connected to one Arduino (maybe - you need to see if that is even possible. Which pins do your accelerometers connect to?). The Arduino then sends data to one XBee to transmit.
It should be trivial to figure out how many (1, one, less than 2, just slightly more than zero) receivers you need.
I will NOT be connecting 6 accelerometers to one arduino. Each sensor has it's own board. Thus, on each board, there should be one xbee shield and a xbee transmitter. From the documentation i found that one receiver can receive from more than one transmitter.