Depends on your front bumper. If you keep your OEM bumper, then it really doesn’t matter. They all perform way better than stock and will minimize heat soaking. Just doing an OEM location IC upgrade makes a significant difference. So unless you go frame cut, it’s not necessary to move to a FMIC behind the grille.
If you go aftermarket bumper and have to relocate your ACC, SVC makes the best ACC relocation bracket IMO. On my Gen 2, I could never get my ADD bracket to work correctly with ACC and know quite a few people with FullRace and Cobb set ups that have had similar issues. Very annoying if you like to use cruise control. I am a huge believer of the FMIC upgrade as the performance difference is significant, but given all the issues on my Gen 2, I decided to keep the OEM bumper stock on the Gen 3 because it wasn’t worth the headache.