Well, I got my 340 SE C channel this week. I have been agonizing for what seems like weeks on how to mount these.
I have a difficult set up. The space right above my RPTV is a knee wall that slants at a ~45 degree angle. I had to drill holes in the top of my previous center channel, and I anchored it to the knee wall with two omni mount AB1's.
I wanted the same flexibility my previous mounting solution provided, but I couldn't do it the same way because I refuse to drill a hole in my new center channel. Also, my previous center channel was irregular shaped, and the slight slope on the back provided a good place to drill the anchors in to have 45 degrees of play to adjust.
To make a long story short, my RPTV's top is just about flush with the knee wall. I bought some 20" metal brackets and a piece of 24*48" piece of wood and mounted to the top of the wall.
I took a piece of my audio component rack and got a custom paint color match and painted the wood to match the shelves.
So far, I'm really enjoying my new center channel, but they sound a bit different than my 170s I use as mains for the moment.
I hope to relegate those to the surrounds and replace with some more 340 SEs.
I have some pics if anyone would like to see.