Sirius is already built in to the infotainment system. Go to settings, Sirius, and follow the prompts. If there is coverage it will work. If not, you should be able to get it through Android auto or Apple Car play, which is better anyway because you can customize the Artist Stations.
The plans are based on the number of miles or kms you choose and the number of service appointments . Usually the number of appointments is based on 5,000 miles or 8,000 KMS. Major items like transmission services, tuneups and brakes are mileage based. Disregard the computer dash reminders.
I had the update done at Cam Clark Ford, Red Deer. They were also prompt and courteous, and have a great coffee machine. Lol.
Have you checked the settings for the lane drift warning? There is an adjustment for sensitivity, perhaps it's set to zero?