My ringke fusion case works with my normal ring. It's a little spotty but then I haven't added my sweet spot yet.
Haven't managed to make the spigen work yet but I'll add my sweet spot sticker and it'll help me to find it.
Edit: Got my spigen case working now as well on my normal ring that means I have two cases that work which is wonderful news.
Both cases work even better with an alpha ring.
I got my Ringke Max to work once with my alpha but it's hard to find my sweet spot with a solid black case on.