Rewiring without opening up the walls?

I want to wire a house that I’m about to purchase as it has CAT5 and is quite old. I’m not going to be doing a lot of wall work so don’t want to be ripping out and opening up walls if I can help it, however the floors on all levels will be ripped up completely (and lowered on the first floor) so I will have a lot of profeesionals and no issues with having them do work, can I have them run the cables under the floors (they will be putting in hardwood) or will that damage the cables ill be using CAT 8.2 and don’t need runs absolutely everywhere mattering on difficulty. So if anyone has any ideas on the best way to run cables without having to open up all the walls I would appreciate it greatly.