Here from a customer that installed our SCC, that surely can be of interest for us all. It is two SCC and on Baby-SCC in the middle:

“The bass traps are mounted on a plank, secured to the baseboard with screws. The bottom trap is secured with a piece of string to the baseboard. The other two bass traps are balanced on top of the secured one but could of course also be secured with the same piece of string. There are no screws in the wall so everything can be removed without any marks. A LED circuit with a remote is arranged behind it all.
The bass traps has a significant effect on the HiFi in this room, which is roughly 5x7x3 meters”