Preadatory mites

I just purchased a set of 300 predatory mites to deal with a spider mite infestation. They seem to have taken well to my plants and have taken up shop under the more infested leaves. Its been a week now and they are still alive so they have to be eating something. Hopefully its mouthfuls of juicy eggs and larva.
I hope they work like they are supposed to. Anybody else tried them?

no but lady bugs also do that on a massive scale and there supposed to be good luck lol