To capture web request for Client IP you need to create new BT.
Select the transaction --> right client --> New business transaction--> search " Web Request - Client IP" --> you can change Match are per need ( use contains/ match if you want to capture any IP or use Regex if you have pattern/ range.
Can you elaborate for Host.
Hot Sensor Placement only support Java Agents and is only needed when you want to change the sensors being placed into the JVM.
Eg, if you want to instrument a custom sensors/method that is not already instrumented or remove the instrumentation from a method.