i have found quite a lot, as well as meteorites. i would say more are found post 3.
i couldn't believe i found 12 meteorites in a area of 400 mtrs, this was on the side of a big crator![]()
The area or distance is about your speed. If you don't move any faster than 10ms you get all spawned objects really close. And yes, the worse the terrain the more time it takes to get to them so flat areas overal gets you more rocks to shoot.
TBH, and I spent quite a lot of time on planets, it seems to be more random than before. Sometimes I get NONE in a single session, others I got several of the 3x packs. There is also the golden ones which also gives grade 4 mats so don't just go for MM. I even got polonium from outcrops.