compatible with WP Fastest Cache?

Yes, Ad Inserter can be used with caching plugins.

If you are usings ad rotation make sure you set Dynamic blocks to client-side.

https://adinserter.pro/documentation#caching

hello again,
1.how to label Google ads blocks with “Sponsored Links”.?
2.can i use page-level ads and in article ads at the same time? thanks!

1. Something like this:

<h3>Sponsored Links</h3>
AD_CODE

2. I wouldn’t suggest.