If you strictly want a 7-figure salary during the campus placements, then Civil Engineering is not for you, neither here at MNNIT Allahabad, nor at any other institute. Even IIT Bombay placement offers will not look lucrative compared to their other branches. 

The actual reasons for which you should consider Civil Engineering at MNNIT Allahabad are as follows.

• Higher Studies: The GATE 2017 top 4 rank holders were from MNNIT Allahabad as was the 2nd rank holder in GATE 2016 in the Civil Engineering paper. 
• Faculty: The faculty is much better than their non-core counterparts and is highly motivated to make their students flourish in the entrance exams. The results speak for themselves.
• Opportunities other than private companies – Government departments such as Public Works Department (PWD), Institution of Railway Signal Engineers (IRSE), Ministry of Road Transport and Highways (MORTH), National Highway Authority of India (NHAI), and various others who select candidates through Engineering Services Examination (ESE). Maharatna and Navratna PSUs take candidates who qualify GATE exam.

• Private Sector: Private Companies such as Gammon, L&T not only visit campus but also conduct off-campus drives and recruit students. Although the initial salary will be lower than top private IT companies.

So, if you are genuinely interested in civil engineering then there would not be any dearth of opportunities after completing the degree.