Yep, that’s exactly what they’re for.
(On a related note, those noting the icosahedral arrangement of the Vertex Portals might think it a little inconvenient that this arrangement puts the ten primary portals above and below the plane of the ecliptic, requiring starships inbound and outbound to perform an expensive plane-change maneuver to dock there.
But the other thing it does is guarantee that the solar-wind vents will never be pointed directly at the antimatter planets. No sense in making the tender moons work extra hard, especially since the solar wind is where almost all the potential in-system particles come from.)