First Boss tends to have Multiple 'Spawn' locals near the initial starting zone Other than the Freebie local given by the Center's hint stone, i had seed that i was able to spawn 4 of them within relative Proximity, which i ended up doing for aesthetics of the Stormy effect. tried building a pen to ' house' one, and even with stone walls... it was made short work of. s'pose outside of a trench + Earthen barriers, keeping one active near your base for aesthetics effect can be at times difficult.
re-summons of a boss for the "crafting build" requirement such as dragon tears actually promotes Multi spawn killings.
First Boss Trophy was always my favorite to Mount on buildings though. and placing a "Swamp Key" on a backwards item stand can add a glow effect for low light ambiance rooms. with slight tedious over lays such as Core wood over Plain wood, you can effectively hide such Display racks as well.

* sadness Bosses of Differnt Biomes have a Peace treaty to each other unlike their minions *