PSA: The 'unmarked' bosses at invasion structures give the same amount of exp and the bosses marked on your map. Kill them.
I always see large groups of people fly right past like 2 bosses at structures to chase a boss all the way across the map.Also while we're at it, the Siegebreakers give a ton of exp and die super fast, so if you see them it's best to stop real quick and kill them as well.