Bought an Asus Mesh wifi system for my 1,800 sq. ft house. Put them on opposite ends and I don’t have a single corner with bad coveragge. I feel confident it would still for work well for a much bigger house. I had done a little research and this was what I came up with as the best quality for the price. I had to watch a YouTube walk through to set it up but it’s not overly complicated as long as you’re patient. Could probably find the video if you ended up needing it.

Don’t judge me I did buy it off Amazon but it was well before the election and boycotts. https://a.co/d/0dOCQqFM