There are usually ways to do this without having to drill through the floor if you are creative. There are probably heating ducts, plumbing, etc that are already going through the floor, although there may not be a convenient way to use existing holes.
I don't like using wireless unless it is the last resort. If you have wood floors and if you are in a location with little wifi interference you may be able to get something to work acceptably. But then why not use wifi directly to the end devices (rpi and tower)?
Read this recent thread 2x hAP ax S suitable for 1gbit Symmetrical?