How to Hybrid Exchange 2013 with O365

Hello

         Our Environment had 5 exchange server 2013 cu16 (CAS + Mailbox) multi role .Now to configure Hybrid then I should install two server Edge or CAS in DMZ Network ? please recommend help me .

         If Install edge server then I can install exchange 2016 ?

         I use exchange management in one server mailbox , so if after configure Hybrid and use tool Management exchange Hybrid to Move user to O365 then does need this server to interent (O365) or I can use proxy ?

Thanks