The easiest way to get better wifi signal is really raise the router to a higher position... you can easily test the reception by getting someone to hold the router higher (1.5-2m) above the floor will be very good, then test reception where signal is weak. If it works, then see how you can have it raised permanently.
I had the same issues when I had my 865. Through some recommendations & thumbs up from users, I got it too. No regrets. But this is only for desktops
I am interested in the cost to do structure cabling for my Starhub fibre.
Can you please inform me what other costs to quote on site?