Where can I get a tester? I asked the electrician to lay the cables from my rooms upstairs to my living room. Would definitely like to test the installation before signing off.

I just pulled a CAT5 cable from each room upstairs (3) to my living room wall where I intend to put my TV.

Unifi come in to living room and there will be a router there. Connect the router to all 3 sockets and that's it. Plus need to connect from router to the IP TV box anyway by the TV.

I can just add switches in any of the rooms when I need more ethernet connections.

Currently at my parents place, I have the WiFi router in the living room, and my PC is upstairs and at the diagonal end of the semi-D house to the WiFi router and it works fine, so no need to worry so much about putting the WiFi router right in the middle of your place.