Originally posted by Fluffy:

https://imgur.com/a/kcMEhwa
I've built a house here, but these stones look like i need them for sth, should i rebuild my house elsewhere?

As pointed above they have no use. I've read somewhere (not official source) that originally devs planned for portals to only be allowed in these circles.

As for your base, it's up to you but keep in mind that theses stones can't be destroyed. During my very 1st playthrough I did find it very cool to build my base in the middle until I realized how cramped it was :) my house was all weird because I was trying to expand but was blocked by these stones.