How can i map these?

:arrow_up_small: These red and white marks are called “forest boundary points”

These areas are used to mark the characteristic points of plot boundaries
(intersections of plot lines, their intersections with the forest and
of the property, on the forest boundary and at contour points
characteristic), of standardized shape and dimensions. (translated)

Can they be tagged as a survey point?

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Based on your description isn’t it a Tag:boundary=marker - OpenStreetMap Wiki ?

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I have been tagging the stone markers as

boundary=marker
marker=stone
boundary:type=forest
format=squared_stone
height=*
inscription=*
material=*

If there is no stone but only a painted marker:

boundary=marker
marker=sign
boundary:type=forest
ref=