@Francesca Argenziano Dall-E model preview documentation is available here for details. I will try to answer the questions based on the information that is currently available.
Where/How can I deploy a Dall-E model on Azure Portal?
At this moment only one DALL-E model is supported at a time. So, DALL-E isn't integrated with our deployments API like other models, there's no need to deploy the model. You can use the REST API to call this model as mentioned in the above reference doc.
In which regions is Dall-E available?
It is currently only available in East US
What are the service limit quotas for Dall-E?
As per the document, Your resource is configured to have a throughput limit of 3 concurrent images. If you would like your limit raised, please reach out to the support alias below.
I hope this helps!!
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