If you want to monitor the infestation, you can make/use rolls made from white ribbed paper (from biscuits or something similar). Cut pieces of 8x8 cm / 10x10 cm roll it up and put an elastic band arond them. Attach them underneath the roosts with a tie wrap (2x) or a piece of thin rope.I guestimate there are 80% less mites than there were after three treatments.
Red mites like these rolls as hiding place during the day. If you see any mites kill them, count them and take the rolls home to put them in the microwave for 20-30 seconds to kill what you didn’t see, any stage of the mite.
No mite catches means you are almost there. Good luck!