A well planned minimal prep veneer case (even Lumineers) can be fantastic. My experience is that most Lumineers providers don't plan them out well and they frequently fracture. A more traditional veneer case tends to last longer, as the material is a little thicker. Veneers cannot cover a missing tooth. Veneers attach to the front of a tooth, so if there is no tooth present, then there can be no veneer. Implants or a bridge are the most common solutions for a missing tooth. I would recommend a consultation with a local cosmetic dentist with experience in veneers and complex treatment. They should be able to answer all of your questions.