Hello and welcome to the forum,
Yes having a smaller unobstructed center channel instead of a larger speaker behind the TV will indeed be better.
As for how our speaker is going to mate with your Mirages, that's hard to say as I'm not familiar with them and your room qualities will end up playing a part in how the sound together as well.
Of course since we give you the 30 day trial you can always give it a shot and if it doesn't work out you can send it back, or alternatively if you really like it you could get a pair of front and left rights from us down the road too.
Hope that helps, thanks!
Jason Hicks
Aperion Audio Guru