You tried boosters , scan are pretty cheap
If you genuinely want the best then you want one or more of these, they used to do a triple pack UBIQUITI NETWORKS UBI-UAP-AC-PRO 24/5Ghz 450/1300Mbps 122m - (Enterprise Computing > Routers): Amazon.co.uk: Computers & Accessories for the older 2.4ghz might be on available for the new version.
I second the unifi AP points, have used them with no issues with multiples strapped together under the same SSID
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