Well, when I did it, I was using 25MHz devices. I bought 5 each of the mice and keyboards so they were identical. That way, I could "pair" one mouse to multiple receivers so the one mouse was always broadcasting to every PC. The normal KVM stuff I did with my USB mouse.
https://www.amazon.com/s?k=wireless+...e_browse-bin_3
You're looking for "RF Wireless" mice, not bluetooth or etc. That $10 Amazon Basics one might work, I just dunno. I cannot remember which one I bought, and that was ~13 years ago. With Amazon, at least you can return them if you can't make it pair right.
If you can get them and connect the one mouse to multiple receivers, then you should see the mouse cursor move on both at the same time. If you get that far, then an easy way to practice the mouse movement is to draw things in e.g. Paint.net and see how hard it is to keep the cursor sync'd up. If you can draw two pictures that look pretty similar, you should be plenty accurate enough to click around in D2.
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