The Incredible Adventures of Van Helsing III

The first map is by far the easiest to do this on. You can also combine it with "Success With Clean Hands" if you want, but if any get near the lair, jump in and stop them then try for that one afterward.

You don't need anything other than the basic gun turrets to complete this. Make sure you build the ones right down the two lanes, and don't forget about the ones in the pit in between them, which you need to warp to via an ink portal. I only bought one level of each three upgrades for each turret. Having more turrets is better than having only a few that are upgraded in my opinion.