I briefly owned and used a TP-LINK RE450 (It was actually an earlier model, an RE355) and I wasn’t impressed. I felt like it may have helped some but not as much as I had hoped. Perhaps the newer model does a better job. At the time I was in a house that was about 1800 sq. ft (about 170 sq. meters) and my router was in the front of the house and I had trouble getting decent internet in the back right side of the house through several walls. However, I also had pretty crappy internet, so that may have also been a contributing factor. Trying to extend crappy internet could just result in crappier internet. Ha. My speeds were around 15-25 Mbps without the extender, and I vaguely remember with the extender while in the front of the house where I was getting “full” internet … with the extender in the back of the house I was lucky to be getting around half that.
When it comes to networking, I am utterly hopeless, but I have a friend who loves doing that sort of thing. He installed two wireless routers in my house. More or less one on each end of the house. They have different names, but logging into one is the same as logging into the other. And you’ll get passed off from router to router as you move throughout the house. That’s my understanding of the situation anyway. They are Asus routers. I am quite happy with the way the setup works. I could get the exact model number of the routers if that’s something you’d be interested in.
Something else to consider (for everyone) is to ask your internet service to send someone out to check on your poor internet connection.
We had a service tech come out for that. He checked the connection from within the house and to the router. He ended up replacing a few coax cables because they were old but our connection was still not as good as he wanted. He they went out to the street and did repairs on the pole. Now we have excellent internet!!