Do Reactors Stack BTD6?

In Mobile, Bloontonium Reactors popping power does not stack.

Do energizing totems stack?

Energizing Totem can stack attack speed buffs from Alchemist brews (Berserker Brew, Stronger Stimulant, Permanent Brew), Jungle Drums, Call to Arms or Homeland Defense, Overclock, Ultraboost’s permanent attack speed buffs, and Sun Temples or True Sun God with Support sacrifices.

Do hero buffs stack BTD6?

You can stack an alch and a village but not 2 alchs or 2 villages. Most buffs can only be applied once. In general, buffs in the game only stack with themselves if they explicitly say that they do, and different buffs stack with each other.