Modifying a plastic electrical box for structured wiring usage
google MPLS. that's what we use in commercial buildings it's also called a "mud ring"...basically a thin metal ring that is threaded to hold the faceplate on. use a level, trace an outline, (very carefully)cut  hole with a drywall saw, bend the tabs align the screw and tighten down. holds like 10 lbs in drywall. least expensive option, can't see it when faceplate is installed.