The web UI (portal) for your assessment(s) leverages MFA whether its hosted in SAAS or hosted on FDP (on-premise). No administrative configuration is required. Users set up their MFA options when registering an account for the Cloudscape product (https://flexera.riscnetworks.com)
The management UIs for the appliances (FDP & RN150) do not have MFA. As both appliances are hosted on premise consider restricting network accessibility to the management UI via internal network controls (acls, fw port restrictions, etc).