I am a beginner but I am having some difficulties trying to recreate the holes and elevations pointed out in the picture. First I thought I could achieve that with a cylinder and a boolean modifier, but I am not so sure now.
I am wondering if I could create a circle and "project" it on the surface in any way, as if it was a sticker or a shadow, from which I could extrude. That would be very useful for other projects, so I would like to know if that option exists in Blender. The shrinkwrap modifier isn't making that work, as I first expected.
How would you guys approach this problem?
Attempt with cube + cylinder