Thank you all. My path is clear ha ha.

Yes. In fact, you can summon multiple at the same time if you want.

Indeed, you can. Just gather the required summoning materials again.

Useful to decorate yeah, some of their “heads” look great on the wall of the dinner room 👌

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 *