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For CS branch, NIET is the best. The placement percentage of CSE branch is about 80% to 90%, which is fantastic. About 40% of the students got internships from college.The highest package offered was about 12.5 lacs per annum.The lowest package was 2 lacs per annum and average package offered was about 3 LPA to 4 lacs per annum, this year.

You can verify this link. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

You should go for SRM as the curriculum and the faculty there is good. ECE at VITEE is also a good option depends totally on your interest. However, you should remember that upgrading your branch is a tough thing. So, I would recommend SRM.

Yes, it can be done from Delhi University.

CS in UPES is better as in UPES we have 95% placement for CS students and faculty is very good.

Yes, you can get the addition in NSIT. Go though counseling procedure and list out your colleges. Put college name series which you want first then after second like wise give colleges name.
Hope you got your answer.

Yes, you will get but not in 1st and 2nd counselings but you need to attend more counselings if not you have to choose the other option.

Yes, you can apply in NIT, Trichy.
Congratulations for scoring 99.18 percentile in JEE! There may be chances of getting a seat in NIT, Trichy.

For CSE branch, I would prefer you to go with any of the Institutes. As placement wise, all the campus are good.