Xamarin - Deploy IOS app for beta testers

I'm developing my first app and have a bunch of beta testers. some for Android, some for IOS.

Android, no problem at all.. Deploy the app ad-hoc and share it with them. But for the IOS version its driving me crazy.

If i want to make a Developement Provisioning profile it asks for the Iphones to associate with it... But my testers are around the globe.. Is there a way to make a simple package, that they can download and install, by accepting some security warnings, and test right away?