When I did our refurb, where ever we wanted a TV, I ran 2 x satellite grade coax, 1 phone line and 1 x CAT5. Our BT line comes into a cupboard by our front door - 1 then ran a single CAT 5 into the loft above the cupboard where I planned to fit the switch - then I ran all the other points back to this - we now have 12 points around the house, plus a backup device attached to said switch.
With CAT5 you need to consider where the incoming broadband is, and where you want to place the switch.
The loft houses all the coax cables - only 8 points are currently connected and this can handle multiple inputs too.
Wifi, is there for the mobile devices.....
If you do something similar, I would recommend 47mm deep back boxes......
Best start writing a spec for each and every room and take it from there...