Suggestions for Pocket Wifi in Albania, Macedonia, Kosovo, Montenegro & BiH

We usually rent some kind of WiFi when we travel so we can have internet where ever we are. We usually use Tep Wireless when we're in Europe, yet they do not work in the countries we are traveling to this year.

Does anyone know if there's a pocket WiFi we can rent that will work in Albania, Macedonia, Kosovo, Montenegro & BiH?

Any suggestions you might have would be appreciated.

Thanks!