3 Mortars stacked on a buff beam surrounded by 3 1DU reflection beams you can hide behind. minions are only really necessary if your mortars dps isnt high enough. holy bulwark should be keeping your monks auras alive by getting by djinns. make sure you dont place it too close to the minions though as sharken might start targeting it, allowing them to get through. 

stats were what i had at that time allowing a pretty chill run without having to intervene. i did start running with a guardian summoner at some point (huntress+monk guardian) and did tend to TB with my aura monk (around 1500 TB stat) when the sharken/djinn rush started but neither should really be necessary depending on your builders stats. did already run this build with main stats about 1-2k lower though. fairly easy run that gives anything from trans to ult++ (if youre lucky lol, RNG aint my friend)

usually startiing in wave 20 with an upper adept. single wave should be enough for building + upgrading at that point.