Just cause the furniture doesn’t mean it’s major furniture. The new furnitures are purple and minor furnitures. But you can only equip 1 major furniture
Zams on the front with only 2 ports? No way, Fire Bombards for sure, maybe Fire Long Cannons. Or even the Blue Specter, since you will be applying torn sails, the enemy will be stationary. And replace the Volatile Fuel by the one that Increases damage to enemy ships with ablaze effect by 10%.
Major furniture only one Pership. You can however equipe as many purple minor furniture as you want so long as they're not duplicates already installed