Look! Mob must be selected and use the function "Value between".
As example: If your x-position is 500, you have to put in Cheat engine "400" between "600". You have to stay next to the mob and now you can use the "changed Value" if the mob has changed his position and "unchanged Value" if it do nothing so itīs just staying on one position.
It would be easier if you take a npc instead of mobs!
€: Itīs so boring. I think i will make a video how to looking for the address! Only the address... not the pointer!