The best place is in Yalahar Foreign and Trade Quarters.
In the pictures below, I could only mark the exact locations for the Foreign Quarter, but tbh I like Trade Quarter more! I just don't know the exact locations, but in Trade quarter it seems you can work on more rare bestiary, like Mad Scientist and Crazed Beggar, which you cannot find many in Foreign Quarter.
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https://tibiopedia.pl/maps/monsters_respawn