What are your thoughts on BlueShield, Qi-Shield, or other technologies that are said to either neutralize/harmonize bad EMF in and around the house? How about wearable EMF products like Harmoni Pendant?

I believe in technologies that harmonize, in fact the Building Biology Institute acknowledges harmonizing devices as effective tools for aligning and balancing our biofield in response to exposure to electromagnetic fields (EMF). 
I personally use and recommend Leela Quantum Tech: https://leelaq.com/?ref=Senergy360LEELAQ.