I need to allow access to multiple sites and multiple machines to a 3rd party. Hopefully allowing them to access and manage from a central logon? Is this possible from within Sophos Central?

We have multiple sites where we have a 3rd party responsible for the support on some of the machines on site.

Ideally we would like to grant them access to only these sites / machines and allow them to manage from a central console.

We can set them up with individual logon's to each of the sites but would like to make support as simple as possible for them.

Is it possible to register the same email address at multiple sites so they could receive notifications from all of their sites to a central account?