mysql multi-source replication to single slave from Debian repo's?

I've been experimenting with mysql 5.7's feature to backup multiple sources to a single slave, but have legacy db's on source servers where I'm not sure if upgrading to 5.7 will break things, and also I want to use standard packages in Debian repositories to more standardized support. Does anyone have experience doing something like this, and/or is there a better way to approach it?