Not for anyone else but Osk.
Hint 1: The DST here should cover the southeast (facing towards the black arrow) while still being able to hit mobs coming from the direct south (the green arrow). The Physical Beam to the south needs to be situated so that the spiders that spawn right next to there can't reach the towers, the mobs from south and west can't reach either the east nor west tower stacks.
Hint 4: Put an app/huntress summoner on the ground to boost the Hint 1 five-stack, hide the summoner, and aggro the spiders from the north and west spawns. Make sure it is far enough to the east (while still buffing the towers) so that the Harbingers don't lightning the summoner.
Hint 5: Put an app/huntress summoner here to boost the Hint 2 five-stack.