How to retrieve singleton model instance with DRF without having to provide id?

I have a django app, and I use django-solo for SingletonModel. I do have a singleton settings model:

class GeneralSettings(SingletonModel):
    allow_signup = models.BooleanField(default=True)

I want to create an API endpoint to be able to retrieve and update the settings. I currently use DRF. Using RetrieveModelMixin and UpdateModelMixin I can easily do it but then my route has to be:

.../api/settings/1 < I need to add the id.

How can I retrieve / update my settings without having to use the id (since it doesn't make sens for a SingletonModel)?

DRF view:

class GeneralSettingsViewSet(
    RetrieveModelMixin,
    UpdateModelMixin,
    GenericViewSet,
):
    queryset = GeneralSettings.objects.all()
    serializer_class = GeneralSettingsSerializer
    http_method_names = ["get", "put"]

    def get_object(self) -> GeneralSettings:
        return GeneralSettings.get_solo()

Router:

router.register(r"settings", GeneralSettingsViewSet, "api-settings")

from rest_framework.routers import Route, SimpleRouter  
  
  
class SingletonRouter(SimpleRouter):  
    routes = [  
        Route(  
            url=r'^{prefix}{trailing_slash}$',  
            mapping={  
                'get': 'retrieve',  
                'put': 'update',  
            },  
            name='{basename}-detail',  
            detail=True,  
            initkwargs={'suffix': 'Instance'}  
        ),  
    ]  
  
  
router = SingletonRouter()  
router.register(r'settings', GeneralSettingsViewSet, 'api-settings')

GET .../settings/
PUT .../settings/