for these , you can set position for tooltip:
about responsive on mobile , we're working on it , and We will fix it. for now You can create another hotspot and enable it just on mobile with small hotspots (you can set smaller size for them).
please look at this: a Hotspot with small spots and text. we've used position for tooltip and smaller spots.
For example, I've changed the position of this point to bottom-right and as you can see, it is displayed well