We've had best results with Tripp-Lite and APC backups. Tripp has been in the power management business for about 100 years.
As for the plug issue, you should check with a technician who understands the connector situation in India. That may be faster than waiting for someone here who knows Indian power connectors to see your question among 100s of thousands of posts.
....because on power surges or power cuts in India.
If the utilities are cutting power, understand that even the very robust and powerful consumer UPS units seldom can provide power to run a computer for more than an hour. If your outages are consistently longer than that, you need a generator.