Yep. We have not too bad issues with dead spots in the house but I am hoping that judiciously positioned nodes of a mesh might enable us to cover more of the garage and garden without constantly switching between booster signals. It is irritating when devices hang on to weak signals when you are close to a strong one.
Do you recommend any particular product?
That's the point of a mesh - it drops the weak signal and automatically switches to the better one. Ours just works and it solves all the previous problems.
In terms of products, I haven't looked for several years, but there was a vast range in pricing. At the top end, they have multiple bands, so the nodes talk to each other on a different frequency to the one you use, so there is no interference. There is also wifi 6.
The real geeks get the whole house wired, so there are a bunch of cables going from your router to your loft, then they power nodes in the ceilings of all the rooms. Those sort people usually use Ubiquiti.
I went for the complete other end of the spectrum and bought 3 Tenda Nova (MW5) nodes for £70. They're not triband. They don't do wifi 6. They have limited slots for plugging in wired stuff. They don't really do high speeds. My 1000 MB connection is only 70 MB at the furthest point, but that's plenty and it always works and never drops, and therefore does the job for me, so I'm happy.
In your case, I would wire the house if it is trivial to do so as that is the best solution. I wouldn't worry about triband as your levels of interference are probably minimal. Wifi 6 might be worth it as more devices get it. Also think about what you might want to plug in and where.