It is important to know the limits of when and where each raid type can occur; the mistland tier raids no longer happen in the meadows, swamp, or mountains as of 2-3 updates ago, so I would recommend keeping ones base in the meadows and portal in/out using as portal network. Put in some Terrains walls, and you'll be super safe in a meadows base.

Excepting "you are being hunted", all raids require you to be within 40m of at least three eligible base items, when scouting for materials with a portal network, if you only ever put down a workbench and a portal, that keeps the area base items to only 2 raidable pieces, meaning you'll be free of raids when out in the field unless you're in the mountains or plains( where the wolf raid can occur).

https://valheim.fandom.com/wiki/Events

This wiki link can be invaluable in understanding the limits of raids so you can plan accordingly.

To date, the only 2 raids that can happen in all current biomes permanently. are the bats and the skeletons surprise(excepting mountains). so interestingly an eventual base in the mistlands can be one of the safest raidable zones after the queen has been killed.

...At least until ashlands come out