Numbers of a population as well as home range play a huge part QDM. It can be done on a small scale. Most say that you need 400+ acres unhampered......it truly is not necessary. Where you live or hunt will determine the QDM involved
You left out two very important factors when discussing a bucks home range and managing deer on small parcels. One is dispersal of yearling buck and the other is the effects of the rut. A study conducted in PA shows that 45-75% of yearling buck disperse. Most dispersal occurs during Oct . and Nov. ,so the bucks you see in the summer may well be miles away by hunting season.
Also ,during the pre-rut and rut there is no way to confine buck on a small parcel since adult buck will travel considerable distances during the rut while looking for doe in season. Since bucks are the most vulnerable during this period ,the bucks you try and protect are just as likely to be harvested by someone else.