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Do you have a choice?

All depends on your layout and wall type, really. If it's drywall and studs, that's gonna be a lot easier than lath & plaster.

Only thing I can say for sure is avoid the electrical cabling as much as possible. Even if you're running shielded, it's best to keep some distance when running parallel just in case. If you're going to be right next to electrical cabling, make it a perpendicular crossing. Both of these will minimize EMI introduction, which can induce a current in the cabling that can cause signal degradation.

If you have an open ceiling (or even a drop ceiling) in the lowest level, you can just put the switch down there, run the cables to underneath the upper rooms, and go through the footer into the wall from there. Just don't use staples, as those can damage the cabling. Plastic clips that screw into the wood are better than nothing, but ideally you can get some J-hooks or even actual cable trays put in to support the cabling.

The other alternative is to drop down from the attic and you can lay the cables across however is convenient (assuming no critter problems up there). Then to get to the lower levels you can match up with the wall in the room upstairs. Just get a nice long flex bit and go down into the footer from the upstairs box straight into the wall below. Then you can just run both cables down the same hole in the attic.

Just make sure you keep each run of cable under 300 feet. Max spec for Ethernet is 328, but that includes cable length from the jack to a device, or from a patch panel to the switch. You CAN just do a straight run from a device to a switch, but if you use jacks and patch panels, you get more flexibility with where devices get located.

Finally, if you're doing it yourself you're not gonna be visited by the code enforcement gremlins, but it's still a good idea to keep to code. My rule of thumb is if it's going out of sight, always use plenum-rated cable for it's better fire resistance. It's stiffer and more expensive, but you get more peace of mind. Then you can use whatever riser cable is cheapest for going between the jacks and devices.

It produces scatter waves which will block anyone spying on you using wifi/cell tower wave technology to see thru your walls. They get an image based on the wifi and cell tower waves bouncing off every surface in your living space. The flyback driver will produce scatter waves which will white out the area around the driver. The more amps, the bigger the white-out field. They are a bit dangerous, though, and you have to build it yourself. Now that you have asked about infra, I am not sure if it would work. I will have to keep it in mind for further research. If you find out whether it works or not, let me know and I will do the same.

Or that they don't simply use it to get the layout of your home for when they invade to take your guns/women/children/life.

It will have an application in every industry and sector. Each week I learn about how AI is introduced into another field of study.