Deploying the same service to multiple VSEs is supported.
However, you must specifically deploy the service to each VSE. There is no mechanism for deploying the service via a single command and having it "pushed" to all VSEs. Once the VSE is identified, the deployment can be performed on the basis of your requirements (i.e., from Workstation, Portal, command line, REST API, etc.).
A caveat: Typically, I would recommend horizontal scaling of VSE instances connected to a single Registry server rather than vertical scaling. If multiple VSEs are running on the same endpoint sever, the deployed services could experience port conflicts because they are sharing ports at the server boundary. DevTest does not provide load balancing capabilities within the product.