I ve mounted a junction box on the stud by cutting into the wall then made a small pilot hole into the attic through the ceiling to register the main hole through the 2x4.
Cable drop through attic multistories.
Drop the string and catch it in the wall cutout and use that to pull the cable through.
I have run the odd cable in my house wood frame wallboard by drilling down from the attic into the hollow wall.
Step 4 drop the coaxial cable through the holes in the floor until it reaches the connection in the basement.
For single floor homes with a basement the basement may be the best path.
There s a 2x4 at the top of the wall with vertical 2x4 studs.
My cable tv is distributed through the attic so it seemed like a good solution to run my home network through there as well.
To drill through a rug make a small cut in the rug with a utility knife and then drill down through the cut.
Use a piece of string that you can add a small weight to such as a steel nut or whatever you can find.
These methods will work for any cable telephone network thermostat power etc.
By using a drill bit sized large enough for the cable.