Cake.
Anyway, there's not much to discuss about ?-8 starting camps. The fifth team to reach the central arrow is the one that will go against the second boss. So just try to have all yor teams reach the second part of the map roughly at the same time as you need to kill both bosses before any team reach the flag, that is reachable from both sides. So, for that you can guarantee that teams in north camp will do the full square, so they'll have a longer route. First team in south camp will have a shorter route and middle is totally random.
I personally went 2-1-2, and cleared it in the first try, but it's just a matter of your own squads speed, so there is not really a recommended starting set up.
I cleared everythng with 3* in the first try except for ?-7, which took 3 tries. I was about to create a suicide team to increase my chances, but it was not necesary in the end in a map with a 50% completion chance.
Anyways, there's something that caugh my eye much more than the map. And that is why is the final boss skill called "Drunk Fight Style"? What are these evil sister ants doing? Is it a pun from japanese language that doesn't translate to english? WTF