I found a really good spot for "Light my fire" Set 10 zombies on fire simultaneously.
Place - Moresby
Items - Zombie Bait x3 and Molotov
Fast Travel to the Abandoned House
Exit front door of House
Head to your immediate right and jump over the wall, head east and you should see a pack of 10-14 zombies.
Spam the bait in the center of the zombies, toss a molotov and viola.