Stoneloom mines
Zygofer's daughter and wife, Martea and Marga are here. They can potentially be of decisive help when defeating Zytera while at the same time are quite dangerous. The book talks about some form of protection or disguise in order to not be eaten right away. I removed that in my campaign.
We do know that Marga and Martea wanted to flee to wailer's hold but were diverted. They ended up with other Marcomannian dwarfs, so Stoneloom should still be near Wailer's hold. I'd place it in Y36 / X37
Weatherstone
Weatherstone is most often used as an early loredump/ treasurehunt that drags players in the campaign, so place it near their starting position. If that is not an option for you,Z27 is often picked for its position.