Multi-node I believe is referring to clustering for high-availability which is separate from tenants.
I would suggest reaching out to the sales teams to discuss the licensing specifics.
UiPath - High-Availability Add-On for Orchestrator High-Availability Add-On license The license provides access to redundancy and stability for multi-node Orchestrator deployment. Each cluster has three nodes and it requires a separate license.
UiPath - Orchestrator - Basic Maximum 5 Robot licenses (Attended Robot and/or Unattended Robot), plus a maximum of 5 Studio licenses Orchestrator Basic is a variation of Orchestrator Standard, with the same technical functionalities but limited to be used by a single tenant in a Production environment.
|UiPath - Orchestrator - Standard|Orchestrator Standard license|The license grants you access to a single Orchestrator instance where you can have unlimited number of tenants.
A tenant is a separate logical environments which includes users, Attended Robots and/or Unattended Robots, processes and data. Learn more about tenants.