Thanks to both of you for your answers.
My mains are JBL L-series L890 big towers and the center is an LC2 slightly angled up towards ear level, the surrounds are L820 and the back surrounds L810 also not fitted yet . It's all powered now by an Onkyo 807 but probably replaced year end by a Denon x4000.
Questioning the LC2 came from reading many reviews where it was said that one should never position the center horizontaly, but is the LC2 horizontal ?
I am currently re-arranging my physical speaker setup as my surrounds where too much in front of the seating place due to the room being a large mezzanine with no wall at all on the right side and a wide stair case on the left, so no wall to hang the surrounds nor any room to fit them on stands. But I have now found a way to suspend the surrounds from the sloping roof at 90°.
I am also preparing the room to fit a future video projector screen in front of the current 55" TV set, bottom of the screen being at 55 cm from the floor and the mid line of the LC2 being below it at about 40 cm from the floor which is wall-to-wall carpeted.
In the mean time I had an opportunity to acquire a single ES30, but have not run audissey MultEQ again ( the only 807 version) with the ES30.
I'd rather keep the LC2 as it visually blends in better with the L890s and is easier to fit in, I am reluctant to simply put the ES30 directly on the floor, but if audio demands I am willing to use it instead.
Here is how it will look like now with the re-positioned surrounds and LC2 :
With future 113" video screen in front of TV and LC2 :
If ES30 instead :
Thanks for any help to decide which is better?