Use the freezing area specified for your model. Some appliances designate a particular shelf or drawer, but there is no universal rule based solely on height.
What the observation tells you
The internal airflow and cooling arrangement differ between models. A storage basket may not be the intended place for a large fresh load. Copying a layout from another freezer can therefore reduce performance or block an outlet.
A useful next step
Read the fresh-food freezing section, keep within its quantity limit and separate new food from existing frozen contents as directed. Do not remove fittings to create extra loading space unless the manufacturer explicitly permits it.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.