You can connect the fans to each other any way you like, so long as you don't pull more power than the the fan header you eventually plug into can handle. (Or more power than the in-line resistor can handle)
Just make sure that the only connection between the group of fans and the board runs through the resistor.
So: header>>>resistor adapter>>first fan>>>>other fans.
Thanks, but just to verify, It is ok to ignore the molex connectors and just use the 3 pin?