https://www.amazon.com/gp/product/B07PPCG1KD/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
I used two of those, mounted to pieces of 1.25" galvanized pipe mounted under the table top. I have a few other posts here from the past week or so talking about the build. I will also be putting out a pretty full log including all the hardware I used.
Pretty sure that would also interfere with your ride. Have you received the C6 yet? If not, I think once you see it in person you'll have a much better sense of the spacing there.
What I did was buy an articulating VESA pole mount (https://www.amazon.com/gp/product/B07PPCG1KD/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 ) and attached it to an old floor lamp that I scavenged parts from. Works like a dream. The only thing I had to be careful of was the weight balance since it was a bit top-heavy and wanted to tip. I added some weight to the base to offset the weight of the monitor and appleTV and it's now rock-solid.