I have never used a table runner but know that if I did, my cats would lay on it.
My cats are not "allowed" on the table however, no matter how strict I try to be, my cats are supervised for most of the day by a DH who will not discipline to my standards. (We had the same problem with our son - who despite this turned out great.)
Go for the table runner and let the cats have a little fun. :-D