Create single and multiple resources using restful HTTP

In my API server I have this route defined:

POST /categories

To create one category you do:

POST /categories {"name": "Books"}

I thought that if you want to create multiple categories, then you could do:

POST /categories [{"name": "Books"}, {"name": "Games"}]

I just wanna confirm that this is a good practice for Restful HTTP API.

Or should one have a

POST /bulk

for allowing them to do whatever operations at once (Creating, Reading, Updating and Deleting)?