The location is not random. Just saw it for the second time by boulder downs at (15,28) in the same exact spot. I was waiting there and it spawned right in front of me. Finally got credit for it.

Also I tried to be nice and hold it so more people could come but what happened was a crowd started building up and once someone started attacking there were so many people waiting that it was over in 5 seconds and most didnt even get credit for the kill. It sounds nice to wait and let people get there but theres really no point once about 10 people are there.