Bingo. In order to report meteorite strikes, there must be 1) people to report them and 2) some institution to track them. If anything, it looks pretty evenly distributed after adjusting for 1 and 2.
Well, not all meteorite strikes could have been reported 4,300+ years ago! This is probably a map of where people have been looking for them. Less developed places, such as in middle America, (which stands out like a sore thumb) might make for good locations to look for such things!
I suspect it would be extremely challenging to observe a meteor from a rain forest, and practically infeasible to find it after. Unless we'll rely on satellite observations
I highly doubt we're able to locate or date meteorites (which are really, really small, especially after they've passed through the atmosphere) with satellites. I suspect we haven't found meteorites in rainforests because we haven't been looking due to the difficulty.