If you are open to an EV and have easy access to charging facilities at home or your place of work, we would suggest you go ahead with one. Your daily running isn't very high, and the Tiago EV should easily manage this on a single charge.
By opting for the Tata Tiago EV, you will also meet your requirements of low running costs and an automatic gearbox. In fact, with most EVs, the absence of a traditional gearbox means there are no shifts at all, leaving you with a very smooth and relaxed drive feel.
On the other hand, most petrol and diesel automatics at this price segment use an automated manual transmission (AMT), which is not a smooth shifter at all. Thus, the Tiago EV would do you well.

