Yes you will have an automatic tip added to your party of 8. Try making your ADR's earlier or later than the popular times, that will give you a better chance of getting a table, getting tables for 8 can be more challenging. FP+ is also doable but like Nikkys said, try getting overlapping times. Having 8 people can be difficult getting everyone coordinated and to try meeting everyones desires, but with good planning you can avoid a lot of problems. Even in the parks you can split the group up at times and meet later as a group to keep everyone happy. Plan ahead with the group to find whats important to each person and what they want to do most to make the trip best for them. Realize you may not please everyone even though youve tried.