Hello @ol_N1gHtM4r3_lo,
Has dips and hills? Is it a Singular Mesh? Is it a Spherical Voxel Planet? If a Singular Mesh, you could possibly use Line Trace from the center of the Planet, pointing in a Random Direction outward. Use collision point between LineTrace and Planet to spawn the object.
https://cdn.discordapp.com/attachments/297037422267727883/609622361360171065/unknown.png