This build requires a Tower Boost Monk to run completely AFK, along with three Summoners: two equipped with Huntress and Apprentice Guardians, and one equipped with two Monk Guardians.
Position one Huntress/Apprentice Guardian Summoner at the Southwest Core. The other two Summoners, along with your Tower Boost Monk, should stay at the main tower stack in the Center Core.
The auras covering both the North Core and the East Core are centered on the training dummy located in the corner next to the East Core. Using the dummy as a reference makes their placement much easier and ensures both cores are properly covered.
The estimated 15-minute clear time assumes you start from Wave 32.