Carnivores themselves occupy the 3rd place in the Trophic Level and above.

It's because that Carnivores themselves, compared to a herbivore, actually eat the meat and flesh from the body of an another organism, while herbivores themselves eat plants instead, and first of all, plants are the organisms that occupy the 1st place in the Trophic Level, because they are the ones that produce and create energy through a process known as Photosynthesis, and second of all are Herbivores like Caterpillars, Monkeys (Those that eat bananas), Cows, Goats, etc. because they are the ones that eat the producers, and 3rd of all are Carnivores, it's because that Carnivores themselves, as to what you've already known, that they actually eat the flesh and body of an another organism, it is the cause of why it occupies the 3rd place in the Trophic Level, because they are the ones that eat the Herbivores (the 3rd order consumers specifically).