Hey Alan,
Well the carpeted floor is a terrible place for your center channel. You want to raise it up as high as your screen permits and angle the speaker upwards to aim the tweeter axis at the front row listeners' ears. This will lessen the sonically damaging early reflection that is coming from your floor. Seeing as you are in the USA, check out
Sound Anchors equipment stands. They sell consumer direct from Florida, make
appropriate stands for Meridian's big center channels, and they are as good as speaker stands get. Before moving to an acoustically transparent screen and a 3rd vertically oriented DSP6000 for a center channel, I used a custom 4 post Sound Anchor under my DSP5500HC. I still use another pair of 12" tall custom sized 4 post Sound Anchors under my pair DSP5000 on rear surround duty to get the tweeters and mid-bass driver above the chair backs.
Happy Trails!
MTB Vince