i believe the MTS wont eat plants but they dont reproduce super fast one at a time and sometimes have heard rams horns wont dont know... there chow around here
Malaysian trumpet snails... they down in the substrate they look like a unicorn... rams horns are another option.... but dont think any produces faster than them pond snails
I'd go with either ramshorn or tadpole/pouch (physa... not Lymnaea), both as long as they're kept well fed will leave your plants alone. Most puffers won't go for MTS because their shells are alot harder than they can deal with.