Great plugin howevevr recycler cant be detsoryed with explo, so simply placing it on the entrance to cave will make your cave unraidable. 
Would need ability to destroy it with explo or force placing only inside base ( floor etc).

I work in the building and decorating trade in a seaside town in South Africa, so right now I'm pulling 12-hour work days 6 days a week, and I spend me off time mostly just keeping up on correspondence and sleeping or listening to an audiobook. This abberant behavior has another workaround though, you might want to use in the meantime.

  "1. Pickup settings:": {
    "1. Enabled for personal recyclers (placed by player)": true,
    "2. Check ability to build for pickup": false,
    "3. Only owner can pickup": false

Enemies can't destroy it, but they should then just be able pick it up, making it's use for defense a pointless waste of resources and if in use, it still counts towards the creating player's limit.

Once work calms down, I'll see how practical it would be to add an optional floor check. The plugin is mostly legacy code written by a bloke I have no contact with, and his code can be somewhat opaque at times, so no promises I can figure it out but I'll try. Hell mode at work should peter out next week with any luck.