Can two unique monsters spawn in the same area?
Solution 1:
Not sure if you are playing on console or PC (probably doesn't matter) but I managed to find a video for the Playstation version where someone find Phyneus the Growler and has a bounty to kill Dale Hawthorne which should imply that they can both indeed spawn together in Westmarch Commons.
The video is here:
Solution 2:
Was looking for Razael for a long time, it finally spawned with Valtesk (which was much more common as a spawn):
Scythys (as a bounty boss) spawned with Valtesk in an earlier game:
