The second question that raises to a barman is “where shall I place the grinder?” and “how shall I place the cups, to the way down or up?”.
Let’s start from the first answer.
If the cups come in contact with the metal, so if there is no plastic net/grating to split the cups from the metal plate of the cupwarmer, then the cups have to be necessarily put with the opening up. In the specific case the cups will get warm by contact, therefore, if put “downwards”, the edge of the cup could get warm excessively, with consequent risk to burn the clients lips.
You could eventually ask to be provided with a plastic grill, when not present, operating as isolating between the cupwarmer plate and the cups. In this case the warming could only happen by hot air.
Pros and cons of the different positions
Obviously it’s up to the need of every bartender or coffee shop owner to choose the most appropriate position, depending on everyone requirements.
My suggestion is to pile not more than two cups each time, at least for the first 2-3 cups rows.