There's been a countless amount of times where I destroyed a health station just for the enemy Aura to instantly place a new one. And god it's so annoying.
This is already the case with Vassili and Aimee so I don't see why it shouldn't be the case for every other merc.
Just make it so every deployable instantly get +5 seconds longer cooldown. Similar to how Vassili's HB sensor and Aimee's SNITCH work.
Same applies to Stoker's molotov and Redeye's smoke if they get extinguished