When we had the house rewrired we put CAT5 cables throughout - at least 4 per room, most rooms had 8 or 12. I have no idea if we will ever use them, but one line of thinking (for having 4) was that it was resonable to assume you would need two, maybe a third, and maybe one would turn out to be damaged - e.g. someone hung a picture! - so have redundancy. We have numerous WiFi repeaters too (solid walls, house not particularly small ...)
The kids complain all the time that they can't get WiFi ... I tell them to "plug in", no problem with reception of performance anywhere in the house when "plugged in", so that would be my recommendation if you get the opportunity. Embarrassingly we stuffed something like 20 miles of CAT5 in the the walls here, I hope it survives the lifetime of the building, and stays useful during that whole period, otherwise it will have been a bit of an eco disaster.