This integration is not intended to be used with large installations or multi-site installations. It may work to do so under some circumstances, but since the API is limited in how many calls it allows per time period, it is for example not possible to have more than 5 sites active a the same time. If more than 5 sites are enabled the integration may fail to load due to long startup time because API calls must be spaced with such long time between them that HA interprets it as a failed integration.