PC Peripherals Recommend a Mesh Wifi system

I have a 100mbps fibre net from BSNL and i have 2 floor house. The signal is pretty bad on top floor. So I was thinking of getting a mesh system. I tried to use a old router as repeater and was having issues with SSID selection by devices.

Also i want it to be little future proof. I am planning to have a central server (SYNOLOGY) in the future and want all devices in my house to have 4k streaming capability.. be it phone or media player.

Kindly suggest a good one.

Currently i only have a BSNL provided ONT modem. Also i do have few houses nearby , and i want good security to my devices and "Central Server".

Also how wise is to invest in wifi 6 ? Even my phone OP7 Pro is not supported as of now. But should i keep in mind for future ?

Edit :

Also if i buy say tplink product deco m4 , will buying a deco x20 work together ? Or say i get netgear mesh product , will it work together ? Can i use another product (same or different company) to extend the range ?
 
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