Hi Anonymous,
the best thing you can do to identify the top universities for MBB is to actually check MBB consultants in a target region on LinkedIn and see which universities they attended; looking at new hires, in particular, you will be able to identify recent trends that may not be reported elsewhere yet.
While analysing different countries, you will notice different criteria for recruiting: while in most of continental Europe MBB hire only from Business and Engineering schools, in UK and US they also hire from a more diverse background (eg History and Philosophy) so far that the university has a top brand.
In terms of specific names, I can share my experience in Italy, where recruiting is done primarily in Bocconi, Politecnico di Milano and Politecnico di Torino.
Hope this helps,
Francesco