You will only need to use 3 summoners max. I used 4 summoners (1 summoner just idling) to test the load and for my laziness (and forgetfulness) of not wanting to put a summoner in and out for the Harpoon and DS pet waves (30/35).

Personally, I do without the reflect beams and just add another Cloud Tower aiming west to Hint 3. However, reflect beams are needed if your damage isn't high enough to wipe the ranged mobs on the north side and if health stats on the towers aren't high enough to tank multiple full strength ogre balls.

Hint 1

• The Cloud Towers are in the doorway and hugging the left.
  • If the towers are in the north room, then the ogres spawning on the top right will beeline for them instead of heading south.

Hint 2

• Summoner with App/Huntress guardians. This should be buffing the Hint 1 tower stack and the Forest Golem.
• The Cloud Tower is positioned and angled so that it can see through the doorway to attack the mobs coming from the northwest (Hint 5 location) while also attacking the mobs coming from the west.

Hint 3

• Summoner with App/Huntress guardians.
• The Cloud Tower pointed west is positioned and angled so that it can see through the doorway to attack the mobs coming from the northwest (Hint 5 location) while also attacking the mobs coming from the west.

Hint 4

• Summoner with App/Huntress guardians.
• Built on the cannon.
  • The Forest Golem is at the south end of the cannon to intercept flyers, while the higher north side allows the towers to get better view for consistently attacking enemies.
• The Nature Pylon is on the ground next to the cannon.