Trellix IPS was built with high availability in mind. In fact, those who initially become confused by the possibilities around Trellix IPS fail-over usually do so because the implementation is actually simpler than they assume initially.
Note the following points regarding Trellix IPS fail-over architecture:
Sensors are invisible at layer 2 and above; the monitoring ports do not even have MAC addresses.
Sensors configured for failover confirm a "heartbeat" once each second.
Sensors configured for fail-over share flow information in real time.
As a result, you do not have to worry about Layer 2 and 3 topology changes when you introduce Trellix IPS fail-over into the environment; and in the unlikely event of a Sensor failure, fail-over is instantaneous and connection state is maintained.