https://wiki.project1999.com/Per-Lev...ng_Spots_40-44
It's not all "AFK camps", but it's a pretty big list (there are 22 locations for 40-44) of places you can solo, many of which can be done "AFK" style. For instance, if you don't mind losing Gnome faction the second item on the list (Happ) is a perfect AFK solo kill (if you set a timer you could even camp between kills).
My personal favorite in that range though was killing Troll guards in Grobb: they're rarely camped (and even if they are there's enough that two people can usually share them), and if you want you could just do the first one (I think his name was Basher Sutok?) over and over between "AFK at zoneline" breaks.