Ad placement and no-ads tier
Take about the top 25-30% of the chat window and put the ad there. Silent by default unless you click on it.
Do #1 but take the followed channels sidebar space instead.
Create a no-ads tier that's not the full turbo thing. All I want is no ads, I don't care about the rest. If there was a no-ads tier for like $2-3/month, I'd be on that.
Ads shouldn't block out the streamer's content, it's the reason why people watch in the first place.
If you're going to force ads, at least show them in a small portion of the screen as suggested above.