Interesting but I think there is better.
Say you make an extra slot (or two)(or 3) for each bot or select bots have more or less slots to allow for different special module attachments and make the modules enhance your bot or give it a special ability.
Say one module is a physical shield that can be upgraded in two ways. First it's strength can be increased and second additional pieces of shielding that can be added in place of other modules to make it like a 3 piece shield for more protection around the bot. Say the first piece is just a frontal shield then another is the left side and another the right.

Another module could be a slow down module where anybot within say 100-200m when activated it's movement speed and fire rate is reduced to half allowing for the advantage.

The opposite of the slow down module is the speed up one. Activate it and gain 5-40% more speed and firing rate over any enemy bot.

How about a camo module? Activate it and bam invisible for 5 seconds like the predator.

Or a power module that when activated gives you 5-40% more damage output depending on how upgraded it is.

Or a resistance module that reduces damage by 5-40% depending on how upgraded it is.

All modules could be able to be upgraded so that maybe they start at 5% and go up to 30 0r 40%

How about a scramble module that when activated gives every team bot within 100m of you stealth ability.

What about a side kick module? Like a module that's a mini drone that follows along side you and can provide extra fire an anciel shield, stealth, healing ect depending on which drone used.