For my Unifi 100Mbps setup for 3 storey house

Main router (TPLink AC1200) at 1st floor (2.4GHz & 5GHz)
2nd router (TPLink Archer C5) at ground floor act as wireless repeater - WDS (5Ghz)
Aztech HL129EP Smartlink (support 3phase wiring) AV1200 powerline for my CCTV/Alarm

I use WDS 5GHz at ground floor so I can get 100Mbps wifi throughout ground & 1st floor - No router at 2nd floor as 2.4GHz signal get it covered.