There are four ways to go with installation.
1. Tire Rack has installer shops which have signed up to be their authorized installers all over the country. You can have the tires shipped directly to the installer's shop and then make an appointment to bring the car in.
2. You can have the tires shipped to you and then take them with the car to the installer of your choice.
3. You can arrange with a contracted mobile tire installer to come to your home or business to install the tires.
4. You can have Tire Rack's mobile installer service come to install the tires.
The mobile installation is subject to there being mobile installers in your area.
You can read about the options here:
https://www.tirerack.com/content/tirerack/desktop/en/deliver_installation.html
Tire Rack offers a two year road hazard warranty. It works through what is basically an insurance company. I just had a puncture and went through the process about 2 months ago. You go to any local tire store and get it fixed. Then you go to their website and submit a claim, sending an image of the receipt for the repair. The insurance company then sends you a check for the cost of the repair. In my case it took about a week. If the tire is unrepairable, it will pay to replace the tire.
Treadwear warranty (if offered) is through the tire manufacturer. This is true no matter where you buy the tire. You can get treadwear warranty from any dealer for that tire brand.