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Ciao pps345
You've recorded the center points of individual cantons here.
These center points can actually be calculated from the cantonal outlines (e.g., for Bern https://www.openstreetmap.org/relation/1686344 or Valais https://www.openstreetmap.org/relation/1686699).
If the center points are specifically marked, e.g., as in https://www.openstreetmap.org/node/7616510930, this stone or plaque can of course be recorded, but I wouldn't add "just" the center point as a separate `tourist=attraction` in OpenStreetMap.
Can you tell us what you're aiming to do here?
Greetings from Bern,
habi