You've posted this in the forum for SQL Monitor, which is licensed per-server that you monitor (in this case, we mean physical server, so a 2-node cluster would require 2 licenses) however as you mentioned Toolkit I guess you're talking about our user-licensed tools such as Compare? (these all fall under the Toolbelt btw, 'Toolkit' is the internal name for our SDK)
Tools such as Compare, SQL Source Control, Data Generator and so on are all licensed per-user, so even if you installed it on a single machine and 5 people logged in to use it, you'd technically need 5 licenses to be 'legal'. The actual activation process works on a per-machine basis however.
It's best to discuss your precise requirements with a member of our sales team who'll be happy to fine tune a quote to your needs.