Trying to implement ads other than AdMob

Question

Desperately looking to switch off of Google AdMob as my ad provider, and I am repeatedly running into roadblocks. Admob appears to be basically the only option that has easy integration for Xamarin. Ultimately I'd prefer to implement either ironSource mediation or mopub (now applovin MAX). ironSource has Xamarin SDKs but they are a bit out of date now as are their demo apps.

It would absolutely make my year if someone has implemented either of those, or literally any alternative option to admob in their Xamarin app and could help me out and or setup/send me a demo app that I could work off of. I've never been more at a loss trying to figure something out, and I'm sure it's ultimately easier than I'm making it. Thanks ahead of time!