For the boosting with 6 people its obvious you need a map with at least 3 turrets. Here is a list of maps, appropriate for boosting:
- Arcadia (3 turrets)
- Mercury Suites (4 turrets)
- Neptune's Bounty (3 turrets)
- Point Prometheus (3 turrets)
- Hephaestus (2 turrets and 1 vending machine which can be hack without taking a damage)
List of maps, not appropriate for boosting:
- Farmer's Market (2 turrets)
- Fort Frolic (2 turrets)
- Home for the Poor (2 turrets)
- Medical Pavilion (2 turrets)
- Kashmir Restaurant (2 turrets)
All DLC maps are not good for the boosting, because all of them has 2 turrets and even less (Fontaine Fisheries has 1 turret)
P.S.: Also, use trials! Some trials on high level are very easy to complete (like 5-10 seconds) and give you a 1000 ADAM
UPD: JMJimmy says on comments:
"Most of the 2nd part of the list can be boosted in the same method as Hephaestus.
Fort Frolic = machine by the rocket turret
Farmer's Market = left of the rocket turret there's a vending machine beside a set of stairs that can be hacked
Kashmir Restaurant = Upstairs bathroom has a vending machine that can be hacked through the wall
etc
A bunch of the DLC maps also have vending machines that can be easily hacked (without using freeze method). Basically any vending machine that has a flat wall on the right side of it with enough room for 2 people can be done like the Fort Frolic."