Mobs cap around 1K, which isn't great, this build could be better optomized, but whatever
Angles, get those right and the build covers two lanes each (NW and SE) seed bombs echo the direction of the cloud towers 2 each direction.
If anything is getting to your main stack, throw some spider minions around, should keep them off.
Party: 1 TB Monk, 3 summoners with guardian pets (huntress/monk)
Alternately Party could be: 1 TB monk, 1 Warden builder, 2 Summoners
Minions are used, so we don't have to mess with the North West Spot at all, they keep stuff at bay, almost any combo of minions will do, just clog the walk in, leave spot with a spider or archer so you can run in and grab the chest. You can post a summoner there if you want to cover it a little better, but may not need it.