Thanks for the great mod!
One configuration I am missing is the option to only show markers for positions where a radar should be placed, but is not yet.
So basically I want to be able to use it as a todo list for cleanup and new placements.

Proof of concept code at https://github.com/Roang-zero1/radar-marker
This is not thoroughly tested, but works quite well for me.

That function would be nice!

Please also add "Remove all map labels with a "Radar Symbol" in it.
Because as i tried a lot of different offsets with your mod, i now have "artefact markers" on the map.

Uncheck "Mark placed radars" in Settings -> Mod Settings -> Map-> Radar Marker

Unchecking "Mark placed radars" does not hide the planned radars, no matter whether they are placed already or placed manually later.