Wow...there’s a whole industry out there selling shields. Also watched a video about creating your own shield using tinfoil and window screening. Bares further investigation. Thanks!
Got mine on Amazon.
One thing is required though.
You’ll need a short length of wire.
One end goes to the screw on the Faraday cage covering the meter and the other goes under a screw on the OUTSIDE of your main box.
The box is normally grounded, so by connecting the cage to a ground, you complete the shielding.
DANGER! Do not connect to a live wire.
Just an outside screw on the main box.