I don't know of anybody that has struts on the rear clam. My setup with the factory hinge and street tail does not , the hinge itself supports the rear clam when fully opened. Hope this information is helpful to you.
I have see some videos with them on a SLC but hard to tell where it is attached? I was wondering if someone had it on there SLC and contribute some Photos
I think he put a bracket there because the rear wheel wells are not installed. I think you can mount the gas strut to the rear vertical surface of the wheel well liners if you have them.
I saw one allens post on you tube where he had the struts bolted to clam .like the pic.... My car also came with the struts also...must be a new addition to the kit