Hey there!
I did my BE from RVCE and I’ll answer based on the placements for BE. I think M.Tech placements follow a similar trend. Since you’re only considering placements, I would say RV is the best both in terms of average package offered and also the highest packages. A lot of the biggies visit RV for placements and you definitely stand a good chance especially with an M.Tech in CSE.
Hope this helps