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The house is about 14 metres by 10 metres overall, so corner to corner you'd be looking at about 17m and one storey from one corner to the other. I was thinking of having three units, one by the router, one downstairs close to the foot of the stairs, and then one in the corner of the living room in the hope the signal from that would also cover the garden and garage.
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Should be plenty. These are the Google ones.
Mesh is your best bet but it’s hard to say how affective it will be without knowing the sort of distances you’re talking about.
Google WiFi (now nest WiFi?) is what i have and it reaches fine between ground and third floor, out into the garden and garage.
If you’re really struggling, WiFi 6 Mesh is now out but two base stations will set you back £700.
The other answer is, of course, Ethernet but i guess that’s out of the question?