Doorstep delivery is offered within courier service (DHL Express, showing as expedite shipping). For postal service, it is post-office to post-office deliver.
If the shipment requires customs clearance at your country, then the shipment is deemed delivered at the point is pre-customs zone.
To claim damage in transit, the shipment must be inspected prior to the delivery point (customs zone if required, your post-office / or your doorsteps). If damage, please reject receiving it without filing with the provider a damage in transit report that you need to share with us.
Signing on receiving the parcel (and/or paying customs charges) is considered by insurance provider as proof of acceptance and releasing providers from all liabilities covered in the insurance.