Hello Ziad,
the setup should be straightforward. HIL and amplifier are connected via SFP, and SFP components that you mentioned are added to the model in order to establish communication between devices.
No custom firmware/software is needed, but if you are to utilize both SFP ports on HIL606, you are limited to using firmware configuration 4 as it is the only standard configuration that supports SFP Simulation Link on both ports. In this case each SFP port would have it's own SFP Send and Receive component in the model, describing the TX/RX payload for each Amplifier.
Also, there is a Typhoon HIL documentation page dedicated specifically to SFP Simulation Link. You can check it out for a detailed description of all SFP components and the protocol in general.
BR,
Aleksandar