Router vs. UTM vs. Firewall: What's The Difference?
UTM interface to connect to on-the-premises router (behind the firewall) with a WAN IP - Management, Networking, Logging and Reporting - UTM Firewall - Sophos Community
Zyxel Advanced Threat Protection Security UTM Firewall for Small Business Includes 1-Year UTM Services Bundled and Sandboxing Threat Protection [ATP200] - Newegg.com