In the electric scooter market, we would recommend you take a look at the Ather Rizta 2.9 variants, Bajaj Chetak 3001 and the TVS iQube 2.2 / 3.1 for your usage. All three have large storage spaces under the seat, with at least 30 litres of space available, if not more.
The Ather is the only one that will give you a touchscreen colour TFT display on the higher Z variants if that is of interest to you. If not, the S variants have the same underpinnings with a few features less while also costing much less.
The iQube and Chetak are proven products and have a straightforward scooter riding experience. They are appreciated by lakhs of people and are sure to resonate with you as well.
A test ride and visit to your nearest dealer to enquire about service costs is for all three in order to make a more informed decision.