Mechanics were known for having a wide range of tactics. Just like how saints would never fall for the same trick again, mechanics would never rely on a single set of tactics. To develop new tactics, one would only need to develop new tactics centered around a core gadget, just like how the core of Lurker Sniper Flow was the sniper itself. Using additional tools like electromagnetic skating shoes, special ammunition, stealth ability, and so on could further strengthen one's prowess.
To a mechanic, developing a new battle tactic was a challenging yet fun task. Brainstorming on new ideas and then being able to bring it to life enabled one to achieve a sense of fulfilment, just like role-playing games.
I have quite a few choices, Rovers, Portable Batteries, self-created Mechas. However, the rovers' attributes and intelligence are weak on their own, and besides, due to their large sizes, they cannot be easily carried around.