Level Indicator for Defensive Structures

I have a lot of towers all at the same level (maxed out).  But some of them I’ve heavily upgraded the Range perk.  And some not.  It’s really annoying to have to click each of them open to see which is which when I’m moving them around on my map.  (For some placements that extra 10% range means a lot!) 

Anyway, when we click on my Bomb Tower now it brings up a little clear bar that says: Level 15.  Why couldn’t it say: Level 15 + 10 so I know which of my towers I’ve been upgrading the range perk for.

I agree for a better and fast legibility