Yeah, the artificial 100 ton limit for hardpoints is a big bugbear of mine (or some other goblinese creature hiding under the bed). I'm fine with the limit for jump drives, but for a one ton socket turret... makes no sense, especially since missiles can still be launched to distant off the same platform. I'm sure its all arranged to make dogfights a thing, even though they really shouldn't be, except maybe in orbital space, but if it made sense weapons range would be based on sensors, not ship volume. Add one ton from 99 to 100 and suddenly you can go from a single 10km range turret (and some firm points) to a triple turret and fire out to very long range with a PA or long range pulse laser...
And yes, I'd build 10 ton platforms with a power plant, minimal maneuver, decent sensors*, and a triple turret (might need to go to 15 tons for a barbette) and spit them out as laser or particle accelerator mines... cover the world starlink-style, except pointing up.
*except you can give them basic sensors and it changes very little... see first paragraph