MECHLINE WS3-KVS (CC260) Owner's manual

I have reviewed the installation instructions for the Mechline KVS WS3 thigh-operated Valve & Spout. This document provides clear diagrams for assembly, including front, plan, and underneath views. It also details how to connect hot and cold water feeds and adjust water temperature. I'm ready to answer any questions you may have about the installation process.
What should I do before fixing the valve to the wall?

What should be noted during the installation of the mixer valve?

How to adjust the water temperature?