High stats needed to AFK. If bringing in a TB, replace the Monk/Imp Summoner.
Characters:
Huntress/App Summoner at Hint 1
Builder Warden at Hint 1.
If you are going to use TB, your upper will replace this character while upgrading.
Huntress/App Summoner at Hint 2.
Monk/Imp Summoner at Hint 2
If you are going to AFK, your upper will replace this character while upgrading.
Your TB will replace this character from the beginning if you are going to use TB.
Depending on your TB's stats, you may need to position your TB between the stacks instead.
The Hint 1 stack needs to be built right into the corner with the Reflect beams fairly tight around against it. This is to protect the stack from spider spawn/jump webbing shenanigans.