There you go, I gave a choice, not a suggestion! (The reward isn’t that much higher after lvl 15 imo vs time spent vs difficulty)
you put your cabin with porx mounted on it, with shoot through parts above those for the rotor. you then make “chutes” to direct the porx over the edge. Then you slide out to get aggro, slide back in and wait. When they get there start dropping them. This is from the top of the tower near the starting point. If you got a buddy, he makes one and parks on the other tower near it and porcs toward the big tower.