You are free to deploy as many evaluative agents of each kind as you want for each zoneType. The number of agents deployed may have an effect on the evaluation of the design if an agent is sensitive to proximity or presence of other agents. You cannot change deployment to 0 for any agent. To make and agent type inactive, set its weight to 0 instead.
(The three currently defined agent types are not sensitive to these considerations, so changing the number of agents deployed has no effect, although keeping it at 1 will make evaluation as fast as it can be.)