How to recess modeling objects into landscape without clipping

This is likely an easy answer, but I have been searching for hours now. I want to create a landscape with multiple water wells inserted procedurally through the landscape. However, when placing the objects, my landscape takes priority and always pokes through the floor. I would like to be able to place various tanks like this about 5 feet into the ground. What setting am i missing? its driving me crazy

Thank you

You cant.
You have to sculpt the landscape and the size of your container appears to be well below 2m of radius.