Thank you everyone.
Sorry forgot to mention, I'm based in HK and the Service Plan includes Wheel Rotation but the Alignment if required is an additional charge.
I have forecasted my annual mileage to be below 20km, which means only one service per year.
I may just go for the 4 year plan, which is only slightly more if I were to purchase the 8 year one.
Just not sure 4 years later whether price will increase. I imagine it can't be too high. Guess that's the trade off.