[HAUSIDMT]

I'm having the same issue, which I thought originally was a bad tire. I was having the humming, and a vibration. I had several issues going on:

-The Ties holding the Parking Brake cable came loose
-The inner fender liner came loose and chunked my passenger rear

These were alleviated mostly by getting new rears, now I have the humming left.
After discussion with a Porsche Mechanic he asked if its your Passenger rear, does the sound get louder with hard left turns? (Yes it does) Does it get quieter with right turns (yes it does). Likely the Wheel bearing, which I ordered from Pelican and am looking to change out as my Thanksgiving Project at home. I'm no mechanic but I'm thinking the diagnosis is spot on.