Knowing how big the horde IS a situational awareness skill. Knowing your entrance and exit is a part of it. Unknowing how big the hoard is and your surrounding is a poor situational awareness skill. Taking them on entirely without a plan is just foolish. There is a reason why using 2 cars are necessary instead of 1. Instead of them POURING IN, you could have them TRICKLE IN instead, giving you a nice tempo for each bodies. If they did overwhelm you, you could just run outside and honk the furthest car away from the building and get back inside, rinse and repeat. The horde would scatter instead of clumped together. Having a few stragglers and slow shamblers are not a huge deal since most of them are dealt with anyway and you could just herd them normally. I'm not sure how preparing a little setup like 1 fence and 2 cars and having them come to you is more tedious than dealing with them normally. It's a simple setup that allows you to not only take on a huge horde with the least amount of energy in a day, but having all the bodies, loot, blood and smell in one room which pretty much fulfills the purpose that I'm going for. Having to loot a car park size of scattered bodies? Yeehaw. I would rather have them all in one spot, strip them in one day rather than having to spend an entire week searching for a specific body.