I like to arrive a day or two before a tour starts in case their are any delays in getting to Europe and to start getting over jetlag. RS will tell you the name of the first hotel and I know people often book that if they arrive before the tour.
For those who have done this tour, would you recommend staying in Luzern or Zurich if arriving before the tour? Are there sights we could see on our own in Luzern the tour doesn't cover or easy day trips prior to the tour to do? Or, since the tour doesn't start until 5pm, would you stay in Zurich and just take train out that afternoon?