Many countries houses have brick internal and external (ours (UK) is - apart from one or two internal stud walls). How do you place a router so that it hits a 4/5 bed house with brick walls?

Airtime contention is a big thing - anything with low signal takes a disproportionately large amount of airtime to carry the same amount of data. You might be able to do it, but everything will suffer (even things close to the AP/router).

We’ve got 4 UniFi APs inside, one outside, and there are still some devices with poor antenna design that are clinging on.