Is a Dream Machine Pro a UniFi NVR protect hardware controller or do we need to acquire the dedicated NVR hardware linked in that page in order to use Protect?
A dream machine pro will run protect. I have a cloud key gen2+ with a 5tb drive that I installed and it works great.
I have this setup as well. I put in a larger drive like you did and the product works pretty well. Sometimes the iOS app won't load correctly but it isn't clear if the problem is on my side or not.