I move vises on & off tables fairly often, and have kept the mating surfaces coated with the same everyday film of what digger calls loob that I try to maintain on all metal equipment surfaces. I don't add anything special like T9. I do however slide a piece of paper cut to roughly the dimensions of the vise base in between the vise and the table. The paper seems to me to add a measure of antiskid friction. I use flat white paper that is just a bit toothy. I don't go out of my way to save the paper between mountings because it does not stand up particularly well to mist coolant.
Just what I do, and not anything I would defend as critical.
-Marty-