Arrow [Q] Root T-Mobile M8 Without Custom Recovery?

Hi all, this may or may not be a popular question, i'm fairly new here, so i'll get right to the point.
I have the T-Mobile variant of the HTC One M8 and all i want is root access for apps on the app-store that can't run without it. I don't want to do a custom recovery, or overwrite any kernels or anything. Just root access. Is this even possible? If not, can someone explain to me why?
Any help is appreciated.