You seem unable to read the question/read the room. OP has a £100 budget. Deco X55 got them halfway to a mesh system. Of course my answer is wrong if the right answer is:You can't be serious... You got it wrong the first time, and your next suggestion is they spend twice as much to get the same outcome as buying a pair of Deco's to fix it?
In an ideal world, i'd like everyone to hard-wire an AP on the in the middle of each floor and the same on any extension, run a patch panel and segregate routing from switching to make upgrades easy and only use Wi-Fi for mobile devices. It's not an ideal world, unfortunately. When someone wants to improve Wi-Fi coverage and speed, the answer is usually going to be my 'ideal world' option or a decent mesh system with a bare minimum of wired backhaul on the master node and wherever possible and dedicated rather than shared radios. Why? Because I can almost guarantee a better outcome than replacing a recent AIO with a 3rd party AIO unless they live in a bed-sit.
P.S. you said you don't know consumer gear that well - X55 has ethernet backhaul and will move OP one step closer to your utopia.
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