You don't want insulated and hidden, you want perforated and airy (while still being discreet). The NUC-like hardware that goes into tanks have chassis consist

You don't want insulated and hidden, you want perforated and airy (while still being discreet). The NUC-like hardware that goes into tanks have chassis consisting of a mesh cage to allow maximum airflow since the cabin temperature alone can exceed 100F.