Yeah, there was a discussion a few weeks ago about dishwasher back wash and after looking into it, it seemed like a bunch of states didn't require it. The vast number of different ways that states go about their plumbing codes makes it damn near impossible to discuss code on the internet regarding the United States. IPC, UPC, NSPC, and a bunch of variations based on them, along with some states using code per municipality. You may as well pile into a clown car as to try to give advice based on code over the internet. That's where my facetious comment above came from. I see so many folks citing code here that may or may not be relevant to where someone lives. It gets old.

Hear that? My eyes rolling so hard into my skull. Seriously dude, what difference will a homeowner changing an air gap to a high loop on a damn dishwasher make? Oh, the Humanity, the world will crash down if the county residential code for a dishwasher discharge air gap isn't met. Give me a break.

If you the arms of a Tyrannosaurus.

Its actually the same 100m recommendation, just with Cat6a.

It's pretty tough to make an ethernet run TOO long in a normal residential application. Even Cat5e max recommendation is 100 meters with about 5ns propagation loss per meter. Even in a very large home, 30m or so is about as long as you would typically see.

With the metric system.

Except for the fact that the computers on the Apollo spacecraft used the metric system internally, then converted it for display so the astronauts could read it. Considering how precious every bit of processing power was on those computers, it makes that statement even more ridiculous. And yeah, I hear that silly statement made often here in the US. Those that use that ignorant meme tend to also use the phrase "measure twice, cut onc...shit" because it's a pain in the ass to subdivide.

Flex bit and placement tool is what you need to drill down into the wall. You're going to have a huge mess if you break that tile floor.

Although, I would cut a couple of feet off of this linked flex bit shaft to make it more manageable to work with. Its the first hit I got in google. My bit is about 3 ft.

https://www.lowes.com/pd/Greenlee-3-16-in-Round-54-in-Drill-Bit-Extension/5001762199

Cut your old work low voltage bracket hole in the wall and install the bracket, then use this kit to drill down. The placement tool easily bends the bit to hit the middle of the sill plate.

I've fished hundreds of low voltage outlets in my career and currently train technicians to do this every month. Trust me, this is the way to fish an outlet down to a basement or crawl.

And as a side note, the person that warned about running comms in close proximity and parallel to power is absolutely right. That can possibly cause some induction issues, aside from accidentally getting into your power insulation with your tools, and should be avoided. You want to keep some space between them.