I have a 2017 GMC Sierra SLE Elevation Edition that came from the factory with DL8 mirrors. That is non power fold, heated and power adjust.
I just installed a pair of factory DQS power fold tow mirrors last weekend.
The answer to your question is YES you can add DQS mirrors on a 2017. I had to modify my door harness but with a bit of research on this forum and a lot of help from pgamboa it works. I had to install a wire each for the clearance lamp, signal lights and cargo lamp circuits plus I had to splice in a ground wire. I also had to buy the proper mirror adjust/mirror fold switch assembly from my dealer (a week and a half wait).
So I have the power fold function, power mirror adjust, heated glass (defrost), signal, clearance and cargo lights.
I cant comment about mirror memory or mirror tilt in reverse as my truck don’t have those features.