Mert, for stability, try some cone coasters with anti-slip stick on's, at least on the back two spikes of each speaker, that should help. Or you get speakers like mine at 300Kg a piece :-)
I listened to the Transparent Opus MM speaker cables this weekend. On my system they sounded fantastic, noticably a better and more open soundstage. Very impressive network pieces, impressive price too!
Ah, I see where you're coming from! The blessings of parenthood. My kids are 7, 6 and 2. They know exactly what they can and cannot touch, a matter of relatively strict education in that department I guess. You have something to look forward to then when your kid is a bit older. In the mean time I hope you have decent insurance just in case of...
Mert, if your room is 6 by 8 meters why is it standing in a corner against the wall with a solid piece of furniture in between? You have such great components, not cheap, but its obvious to anyone that you get nowhere near the sonic benefits these components are capable of delivering. Ask a dealer near you for some plain advice. Some posters above already made some suggestions, and sometimes its a trade off with other room furnitures. But before you continue on your component upgrade path, try some room placement/treatment next. You'd be surprised.