" Where are the trustee's fees reported?"

If you are going to continue to treat this trust as a grantor trust (which you most likely should in the absence of language to the contrary in the trust instrument or state law), then the fees will be reported as a miscellaneous itemized deduction on Line 28 of Schedule A.

In TurboTax, accomplishing the foregoing is difficult without having access to Forms Mode (available in the desktop (CD/Download software) and doing an override. 

Regardless, the fees should not be subject to the 2% limitation (which is simple to enter with TurboTax) and the solution for online products, albeit rather imperfect, appears in the screenshots below.