Today I learned that Frequency Shielding Paint is a real thing. You can paint your walls to protect yourself from WiFi signals.
CFA40 is a carbon fiber reinforced, solvent and metal free high quality paint for indoors as well as outdoors. One single coating of this paint already offers a shielding efficiency of 99.98% against the adverse effects of high frequency radiation caused by cellphone towers, wireless LAN, etc. („HF-Electrosmog“).
Shielding Paint | Shielding Solutions | Gigahertz Solutions : https://www.gigahertz-solutions.de/en/shielding-solutions/shielding-paint/#Abschirmfarbe CFA40
And for people with chemical sensitivies:
We know many electrosensitive people are also chemically sensitive. And the idea of painting anything can be a scary thought. Air Pure solves the problem of combining a zero VOC formulation with the RF shielding ability of conductive Nickel flake to produce an excellent water based primer for your walls and ceilings. Simply paint on like you would any normal primer, ground, and cover with a latex paint of your choice. Intended for interior applications.
Electromagnetic Field Shielding and Conductive Paints Retrieved 7 May, 2018
You can have a lot fun searching up reviews about this and reading the most unbelievable claims about improving health, sleep etc etc. I would use it on corporate bathrooms.