Switch luggage rear rack Commuter:on 7

Hello,
The native luggage rack on the Commuter:on 7 is not stable and I would like to transport heavier loads.
Do you have recommandation for a better luggage rack? I don’t have an eyelet on the seat stay, so I’ll have to use rear rack adapter for seat stays without eyelets.
I use 3.1 ortlieb, but I can add an adaptator if needed.

Thanks!