This build was made and tested with 6k main stat heroes. It is made to be as safe as possible especially when your tower boost goes down.

Build Note 1: With 6k Aura Range, I shrunk the Ensnare Aura by one so that it wouldn't overlap mob spawns.
Build Note 2: The Reflect Beam is purposely placed to deal with Spiders and the Ogre Spit Balls from the Northeast spawn.
Build Note 3: Ogre Minions are there for added protection. Use if you struggle, but I didn't find that I needed them during my tests with 6k builder.

Wave Note 1: For the early waves with ~1750 mobs, I stop tower boost at 1600 and then start the tower boost after cool down to handle the final Genie/Sharken rush.
Wave Note 2: For the waves with ~2650 mobs, I stop tower boost at 2500 and then start the tower boost after cool down to handle the final Genie/Sharken rush.
Wave Note 3: I used a tower boost monk, two Summoners with Apprentice and Huntress Guardians, and a Summoner with two Squire Guardians. This last hero could be whatever you wanted like a Jester for gold wheelings. For me, the double Squire Guardian Summoner helps when you are on the lower stat side of things. With higher stats, we have alot more options.

Arrows
Blue = Cloud direction

Video
Maybe...