We only use the 'right' strip of the dual header but to make it more mechanically stable we have a dual header to plug into.
The 5V power pins can be fed from the MicroUSB connector when the switch is flipped to ON. Otherwise you can leave the switch OFF and power the Pi from the standard power port.
Note this will back-power the computer USB port. We've never had an issue with this as long as the Pi's power supply is 5V, but if you want to avoid it, cut the bottom Switch Enable trace. (Also good to do if you want to make sure the switch isn't activated by accident)