It is hard to tell from your pic but I am going to assume the TV is on its stand and not on the wall.
Don't fret, you have several options:
1.) Although not ideal, one thing you can probably do is place the TV atop the center channel speaker. It "should" support it. But this is not ideal as you will not be able to tilt the center speaker up or down, if necessary. And you may not want to or be able to pull the center speaker to the front edge of the rack. It is not good for the speaker's front edge to be behind the front of your rack, particularly if it is directly atop it.
2.) You may be able to find something that will straddle your center speaker so you can make a little cubby for it and place the TV atop that. Almost anything will work as long as it will support your TV. You could also easily build something like that. Two supports on either side of the center speaker that are a bit taller than the speaker and a shelf that goes across the top. Voila.
3.) As pointed out, the speaker may fit in front of the TV's stand, especially if you push the TV back. The center could then also be tilted up or down, if necessary. If the speaker has to hang off the front a bit (within reason, of course), that is actually a good thing. And, if need be, you can easily raise the TV an inch or two (or more) by placing something under the base of the stand.
4.) Also, as pointed out, mount the speaker above the TV.
Option 3 is probably the easiest option and it may also be the best option.
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