Kills per minute is about 40% higher in NM Survival than NMPS AFK builds I know of.

Under 3 minute build time. Average a little under 2:15 for each combat wave after initial upper wave. Total time including build time is under 35 minutes when doing waves 22 to 35.

Each Summoner has a Huntress guardian pet and an Imp pet equipped.

To have the Summoners AFK on the chests, they'll need enough HP to survive while being healed by the Holy Bulwarks. The heroes on each wave will attack them, which the slight nudge will make the chests open. Otherwise, you'll need to put the summoners on the right side of the map in safe spots. The top right's safe spot is on the fountain and the bottom right's safe spot is on the northern side of the rock, halfway up it.

Hint 5s (with some notes of the area)

• Where the 4 Summoners are placed:
  • Top Left: pretty much on top of the chest with the Holy Bulwark in front of the chest.
    • Make sure the only auras the buff beam buffs are the Strength Drain and Electric auras. If the Ensnare aura is buffed, then the mobs exiting the spawns will slow down, which results in slower kills per minute.
  • Top Right: in the corner, inside the chest that spawns.
  • Bottom Left: on the decoration sticking out of the wall.
    • I like this being my "player 1" Summoner because I can just stare into the wall in 1st person and protect my eyes from exploding traps littering the screen.
  • Bottom Right: on the foothold between the bottom and top of the rock.
    • This allows for the Summoner to be safe/healed, while also being able to repair the traps. The top of the rock is somehow too far and the Summoner is more likely to get knocked off the lion statue.

Building Tips for Speed

• Start with your Monk builder, and run forward into the building with two chests (which is the default direction your character is facing when you spawn in). Grab the top chest and build the Monk and Trapper stuff.
• For ease of building the Inferno traps in the top left area, you should build with your Trapper before your EV.
• When running around with the EV, I like to constantly grab chests to make sure I can upgrade the beams to 1 star.
• Build with your Guardian last.

First Combat Wave

With all the buff beams first upped to 1 star before starting the wave, have just your upper out and upgrade as much as you can. If you start with the top right and go clockwise, you'll be able to upgrade everything except part of the top left area. You can use your Summoners to upgrade the rest during the later waves.