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How do I run ethernet, speaker wire, and coax through a wall into a crawlspace?
When my family moved into our house, there were holes in the floors where the coax cables meet the TV's. We've kept with this for a few years and have even pulled a few ethernet cables through the holes for our computers.
Next week we are having new flooring installed through the entire house. I don't want to be drilling any holes through our new floors. I would much rather have a wall plate with RJ45 & coax keystone jacks or something like this:

I would have no problem installing these jacks in the wall, except for the fact that I really don't want to have to tear the wall away. We have a crawlspace where all of our wiring is ran to the holes in the floors. I believe I would have to tear the wall away, drill a hole through the sill plate between the wall studs for the cables to pass through from the crawl space. Does that all sound right? I've never replaced/repaired drywall before and I'm pretty sure it would look awful.
I couldn't find any articles or videos of someone rewiring their house with the purpose of not running data/a/v wires through the floor. I guess my question is how should I go about doing this?