Well, they appear to have at least 2 already: https://i.imgur.com/vwyhCw6.png
Also a cursory scan of Torshavn shows lots of roundabouts, eg https://www.google.com/maps/place/62%C2%B001'16.2%22N+6%C2%B...
https://local.fo/torshavns-smiling-roundabout-wins-internati...