There are certain installation requirements needed for each model, please refer to their specification for instructions.
For example, to install the TE-BH10 / MD-H10 ('H' line - shallow depth) correctly and ensure the units do not overheat - it is advised the a gap of 30mm or more is left at the back of the unit - firstly to prevent any unwanted vibrations but also to allow warm air to escape above the wine wall.
The cool air enters the wine wall from the bottom so the feet must not be covered - the airflow should be free and unhindered.
For built in installation, there must be a vent / open space at the top of the unit to allow warm air to escape.
The shallow depth 'H' model must also be fixed to the wall with the provided bracket for stability purposes.