Right now it is quite impossible in a multi monitor environment have a CLI command to move the mouse cursor in a monitor without issues.
Kwin has a lot of stuff to move windows between monitors but not the mouse itself.
I did a tiny C++ tool to move the cursor with a virtual pointer few days ago it is not perfect as positioning but right now works. Before the mandatory switch to wayland I was using xdotool with Xorg.
I saw that Wayland with the relative pointer API doesn’t allow a absolute positioning and that not exist something like that. So when you use that API position the mouse in the monitor where you are and not across the monitors.