There is no limitation on the number of different models that can be used by the API.
The Developer license is for the application developers only. This license allows to have two concurrent instances running simultaneously on the development machine in order to be able to test multi-access applications.
This license is not an END USER license.
To distribute products or In order to internally or externally distribute products or services that integrate the API, internally or externally, please contact us to for the terms and conditions of the license. The license will define the number of machines/servers and concurrent accesses.