I use a 200 ton version of this design, the Trapdoor Spider class JPD base, and have been quite pleased with them. 20+ size 1 box launchers (warhead strength 3 or 4, depending on tech), decent sensors, deployed in packs of 5 (fills a hanger bay on the small craft tender). The low cost, small crew size and almost excessive time-to-failure perfectly fills the need for a long term low fiddle-factor defense network. I've tried various other options, such as mines, drones, buoys, larger bases, mobile unit, and keep coming back to this solution.