Every time I have dealt with a rodent issue they ALWAYS eat the poison pellets. Now can you live with a dead mouse somewhere? Maybe it isn't the best inside way to catch them. But if you hit them with pellets all along the outside of your house 2-3 heavy sweeps over a course of a few months they will all be dead or close. They share food when close. I have done this on a couple houses and I not only killed the mice but didn't notice a chipmunk or squirrel for a while. I would try this even if you have an inside problem because often they will nest outside right by your house.
Rat mites consume blood. They may be choosy about who they bite and not everyone has an allergic reaction to the bite.
This part may be unnecessary but I took everything out of my room and put it in the garage. I put the items in sealed contractor bags with a nuvan strip each. I hung a nuvan strip in the garage. I washed the floor, wall edges, all the nooks around the windows, and the crevices around the room with diluted pinesol.
I used boric acid along the edge of walls and in the bottom of dressers. To my knowledge, boric acid kills roaches either by being consumed and destroying their stomach bacteria or on contact by cutting open their exoskeleton (like what diatomaceous earth does). So for the latter reason it might have an effect on the mites. But it's not worth counting on.
For assurance, I sprayed Lysol around the edge of the walls and that kills the mites on contact.
I set a peanut butter rat trap in the crawl space. Several hours later I heard squeaking. There was one live and one dead rat trapped. I sprayed the area with Spectracide Bug Stop and got rid of the rats. I set a new trap and expect there are more rats.
I got 1/4" hardware cloth and I'm going to patch the broken foundation screens around the house. There's also two air vents that need to be screened to prevent further problems with birds/rodents.
The mites are a symptom of the rat problem. Once the rodents are controlled, the mites should dissipate.
Best Answer
Time to look into every nook and cranny. Pull the fridge out, check all cupboards, clean under all furniture. Location can be anywhere were there is a food source, which can be just about anywhere food or organic material can fall/kicked under/forgotten about.
Start with the obvious locations first; in/around trashcans, pantries, fruit/vegetable storage, fridge and cooking areas. If you have pets, check any area where they could possibly get and leave a mess (under/behind furniture).
Also they have a life cycle that is anywhere from 1 week to 4 weeks. If you kill the first wave, keep up looking/cleaning as the second wave can still be in the process of maturing.