Raids happen no matter where you are. The type depends on which boss you've downed. I get raided by draugr all the time, but I get trolls more often than not. I made sure I have a very deep moat on 4 sides. My buildings and anything smashable are 8m away from the edge. And now I just laugh at them. They can't touch me. Took me a lot of time to build such a huge platform, but it was worth it.

The reason I'm putting so much time into it is that my base is my base for good. I'm in the Meadows, close but not in a Black Forest. As I defeat successive bosses, the raids will change and get more dangerous. It doesn't matter where you are - I'm nowhere near a swamp biome and yet I get regular visits from draugr.

The wolves event is evidently different in that it requires you to be AWAY from your base. There's lots of good advice in the forums and on YT as to how to handle them.