I’ve run mine under the floorboards. CAT6e flat-band cables with multiple redundant outlets. Not a great solution in a finished house, but when redoing the floors, it’s great. From room to room just drill through the wall below the floor level and pop the cable through. I’ve crimped mine myself so the hole is literally tiny, but even for a regular connector you don’t need all that big a hole.

In case I ever need to replace them, I hope I’ll be able to attach a new one to the old cable and just pull it through slowly.