Dual z end stops skr 1.4 turbo

On the z-axis there are 2 motors, and 2 endstops. The SKR 1.4 Turbo has drivers for each motor but there is only 1 place to plug in a z endstop. Where does the other z endstop go?

What I want is to work both motors independently to get both endstops triggering at the same time. That will be my Home position.