Yeah the spawn rate seems weird at times… I had one situation where I was exploring and had a consistent sequence of about 4 meteors that would fall a few minutes right behind me as I ran… It’s like I was being chased. lol.
Added to that a place near me had 9 meteors in the same area and not many in other areas around it and I’m not it a very populated area. So while clearly landing is random there still seems to be an issue with the random generator that it still puts them in the same area around you.
I’m still also seeing 3 portal each time… never had a chance for only 1 portal to show. Of course I don’t stay to long to see how well things drop out of them.
As for the sound, I think I heard a phantom once but cannot confirm.