Placement percentage of MTech from IIT Kanpur in CSE branch of 2019 was around 22% and it varies. Also you having it completed from IIT Kanpur don't need to worry much about placements. As most of the students from IIT Kanpur get placements easily but all you need is an decent CGPA with no backlogs.
at present we do not know the 2020 placement status due to the on going corona virus pandemic, however we can tell you about 2019 placements,
During the year 2018-19 the average package for M. Tech students was 9.18 lpa. Placement for M. Tech CS closes at 54%
apart from IIT kanpur, IIT Kharagpur also serves good placement rates.
hope that helps