Grounding for new meter at detached garage
I have a question regarding the grounding electrode and rod for a new meter service I'm installing in a detached garage in TN. The exterior wall of the garage where the meter will be located, already approved by the power company, is inside a carport attached to the garage. So I don't have the ability to drive the ground rod right next to the meter without drilling through the solid slab of 12" concrete. Is it permissible to run the grounding electrode along the inside rafters of the carport and down that exterior wall to the grounding rod outside there? If so are there any special precautions I must take to protect the electrode (i.e. run it through PVC conduit)?