Geosynchronous moon orbit in a postition towards the earth would make sure we always could communicate. Any other position would require satellites in orbit around the moon, but that might be something we should do anyway.
But as far as I understand, the proposed moon space station will act as a refueling / resupply / slingshot / crew quarters station for future Mars mission. But I could be wrong.
If I’m not mistaken the Earth already occupies the geostationary moon orbit.
Isn’t there leading and trailing LaGrange points for the Moons orbit? That might work better with a 2 or 3 satellite system.