All AMD GPUs since some time use PPT - I was setting them for my old HD7950 when I was still mining w/ it.

Process is exactly the same as for Vega.  Create one using ODNT (or download one if you're feeling lazy and don't mind applying mystery settings to your GPUs), then just double click the reg file.  I'm assuming you're talking Windows - the Linux process is a little more involved.

Btw, PPT was required for vega early on, because you couldn't properly undervolt w/o it.  Same was not true for polaris, so using PPTs is more of a process choice (unless being used for more 'under the hood' things like modifying fan tables)