@Alexandre. Thanks for the reply. Now, I get it a little bit more. Let say my current situation is assuming a 100mbps wifi on the main, on the satellite 2 I am getting around 20~30mbps only this is...

Pretty sure their website advertised it as a daisy chain product for Deco M4. https://www.tp-link.com/uk/home-networking/deco/deco-m4/v1%20(3-pack)/ However, I have a deco M4. We live in a 3 floor...