Snake mites do tend to travel upwards, so all surfaces/areas are potential hiding spots.
As for species-specificity, Ophionyssus natricis (there's the search term to use online if you want to try to avoid misinformation sites) are known to parasitize skinks, and occasionally humans. No reason to freak out about that, but do be aware.
Not to dispute any recommendations made here in any way, but I personally would (and did, the one time I bought a mite-carrying snake a long time ago) use PAM. It has residual protection, as it kills mites on surfaces for some time (a month or thereabouts), and so prevents "re-infestations" (= failed treatment). Permethrin is very stable on surfaces once it dries (it is what is used in tick-repellent outdoor clothing, for example). There is published research showing PAM's safety (here).
Other keepers have other recommendations that have worked for them, or are more in line with their own personal cost/benefit analyses. It is good to have all the facts and options at hand when making a decision.
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