The buff beam without the app stack only needs to be upped  to 1 Star   u dont need to upgrade any tower exept the 2 buff beams

do the APP >Tower  stack on the buff beam with a reflect wall  right in front of item box

I use on F2 app builder for dmg passive and F3 ofc tower boost monk r 24 or r29 i just add 2 sommoners for extra pet drop 

The stats i wrote to the build are needed to do it without hermit golems --> it got checked by a other player the shown stats  where his stats when he was lower stats

i am not the fastest builder but

Here is a Youtube video where u can see how i thake the chests for fastest way possible 

---> https://www.youtube.com/watch?v=X2yAFXMjMiM

FOR LOWER STATS   : 

 i recomend using a golem on the buff beam as well maybe even a upgrade adept if it fells needed

 if u have really bad stats maybe use 1 golem on each buff beam  :)