Text Labels show on mouseover (instructions help plz)

I have reviewed a few different instructions for this and am still doing something wrong…

I have some game counters that need two text labels always displayed (easily done), but also have several that I need to display only upon a mouse-over so there is no information clutter, and less text overlapping when units are in neighboring grid cells. I am using prototypes.

I am attempting to use the mouse-over stack viewer, html and “markers” so that this works for both stacked counters and individual ones on their own.

Could someone please provide an example setup instructions since clearly I have failed at some step?

What do you currently have as the mouseover stack viewer text setting? I think it defaults to $LocationName$ or something similar?