With reference to creating zones for drone larvae to entice the mites into, I used to use a super frame and let the bees build drone comb beneath.
During the three years I did this I kept a record of how many mites were found on either side of the comb.
Year 2005 34 mites in total
Year 2006 26 mites in total
Year 2007 15 mites in total Yes I did every cell on the extracted comb as I wanted precise numbers.
Now I do not bother with drone comb for enticing the mites, I leave that to the bees to draw drone comb and use a capping fork to see if there are any mites in the cell.
I have one hive specifically for drone rearing. This has two frames of drone comb and the queen (Bless her cotton sox) does not lay else where in the brood chamber. With this hive I periodically cut out about a 4 inch square and check every cell. The bees soon rebuild the empty space.
This way of checking for mites is my way of dealing with Varroa and I do not always bother doing a mite count, naughty I know.
Regards;