Plains has a lot of large boulders you can use to make high enough walls to prevent raids from dealing a lot of damage to your base. Raise the ground a bit and then put up some sort of wall or fencing and you should be fine.

My new play through has my first base built on an offshore boulder in meadows. Never had a raid there. Eventually after killing first and second boss I explore and find a nice swamp which also included bonemass (had no idea it was there) where I built another small base on top of one of the sunken crypts. This is where I had my first raid ever of skeletons/drauger which I could've ignored due to having an earthen wall with fencing lining the top but I wanted the free resources.