I've seen a few videos on YouTube about Whitestone's case compatibility but don't know of any lists.
I've tried it with the Bodyguardz Ace Fly & am using the Spigen Ultra Hybrid now and its tight fitting low profile. Both work well... From what I've seen its compatible with most but not positive.
Unicorn will be a tight fit and I know SRA is good. Test it by placing Whitestone Dome glass in while you have these cases on before applying the adhesive.
I have the Whitestone Dome installed on my S9+. I'm using the Spigen Ultra Hybrid clear case. I love the Whitestone. I was a little apprehensive installing it but it was a breeze.
I'm using the Speck Presidio Grip case on my S9 with Whitestone protector applied, fits perfectly. Best screen protector on the market for curved screens and well worth the cost.