You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
I purchased a 2017 (Sept) Model S (haven't received it yet), w/multi pattern seats. You mentioned in your post the seat covers are for "non-next gen seats" Would you know if your seat covers would fit 2017 multi pattern seats?