Do Z-type and S-type visa requests require plane tickets and hotel reservations?

I'm about to send my documentation through a travel agent to request a z-type for myself and s-type for my wife and son. We have not bought the plane tickets, nor have we been instructed to by the hiring company. This website makes it fairly clear that airline tickets and hotel reservations are only necessary for tourist L. Regardless, for peace of mind can someone definitely answer...

Do Z-type and S-type visa requests require plane tickets and hotel reservations?