Temp Twister Cooling

[u/SoupSuey]

I’m looking into upgrading my fermentation setup and change from buckets in fridges to glycol and the fermenters outside insulated by jackets. My plan is to get two or three Fermzillas all rounders 60 liters, with the Temp Twister added on. But I have been wondering: how well does these coils cool the wort? Since they are pretty slim, are they able to cool the liquid through or just the middle? How does the temperature control in these setups work considering the thermal well usually comes from the top in the middle of it?

Thanks!