I'd ground pin one to the chassis as soon as it enters the chassis ie have the shortest possible distance between pin 1 and the chassis. Then make this ground point the ground for the signal grounds star ground. Or ground the signal ground near the PSU's filter caps.
Ground the other inputs pin1's as soon as they enter the chassis, not at this star ground. You really don't want the noise that the xlr cables shielding picks up to get into your signal.
Remember that the 48v phantom powers current returns through the cables shielding. You do not want to ground it to the pcb. Ground it to the chassis as soon as possible.
Hope that helps. (sorry for saying 'ground' so much :grin: )
Rob