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The downside is it does have a limited range, so it has to be placed with care. I find my tank experience is usueful to herd in new groups of mobs back to the mortar should I clear up a group too quickly.
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As per my Mastermind Guide, from the "Powers: Utility Pools" section...
"Teleport
While covered in Synergystic Travel Powers, it bears mentioning that Recall Friend is an excellent power to take as well. This enables you to further micromanage your henchmen, but more importantly to */Traps Masterminds, it allows you to reposition some of your secondary pets like Acid Mortar."
You're welcome 
And read the guide, it's really good
Zaprobo old buddy you've made my day. I'm still staring at the screen with the cheshire cat smile.
Muhahahahaaahahahaha!
Zap,
Odd question: does Acid Mortar count as a movable pet for the purposes of Group Fly?
*ponders the idea of dropping acid from on high on hapless Longbow emplacements*
Is it time for the dance of joy yet?
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Odd question: does Acid Mortar count as a movable pet for the purposes of Group Fly?
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No, it's totally immobile (and you even have to be on the ground to deploy it) - consider it the same as Auto-Turret from the /Devices Blaster Secondary.
It's static, won't move, won't hover. Least it's not like the Triage Beacon!
I just wanted to rant about how good this power is - and how its odd I don't see it in use very often.
I've got it 6 slotted; 2 recharge, 3 def debuff and 1 acc. It's absolutely awesome - it makes it a breeze for my pets to hit mobs and thanks to the resistance reduction they do more dmg. Whats more, it has heaps of hit points - so much so it can tank for me.
By placing it down first (putting myself at risk) its first splash aggros the group, allowing me to focus my pets on taking down each target in turn - it usually lasts to the end of the fight quite nicely (and with Repair it lasts even longer).
The downside is it does have a limited range, so it has to be placed with care. I find my tank experience is usueful to herd in new groups of mobs back to the mortar should I clear up a group too quickly.
If you have traps, make sure you get it!