Hi, I'm looking for some advice please.

I currently have a TP Link Deco M5 setup, with 6 devices across the three floors of my house - 1550 square foot.

I have this operating in router mode, with the one closest to my Sky router connected via ethernet.

The supply speed is 500mbps upload, which I do almost achieve if I'm standing right next to the router-connected M5, but naturally throughout the house it fluctuates and averages at around 50mbps - 90% loss from the supply.

I've been doing some research on the XE75 and wondered if you would recommend this? - purchasing three, one per floor.

The router I currently have is the standard Sky provisioned, which I'm guessing is pretty poor. Is there any benefit to me also purchasing a new router to replace this, if I am to purchase three XE75s?

Any help or advice is greatly appreciated, thank you!