How to central manage various outside email accounts in Zoho?

How to central manage various outside email accounts in Zoho?

We just created accout and we are testing various features. We currently use google app as email host and we do not want to change it. We see that we can still setup POP to get emails from our existing google mail, but how can we manage them in one central inbox/folder? We have 30 email addresses in google mail. It seems like we have to create POP for each one of them and switch between them. But we want to manage all emails from all email accounts in one central folder. Can we do that? We tried creating folder and filtering , but again it only works for one account. Can someone advise?