Hi,
Yes, it's a matter of adding as many machines as you'd like, license-permitting. No packages or any effort needed.
On the new machines turn on the interactiond logging module and the web module.
Inbound interaction is designed for horizontal scaling, with queries being single row key lookups that are processed in js on the interaction server.
Doesn't have to touch the db at all for anonymous traffic.
Thanks,
-Jon