For this reason I have made myself to the search for suitable angle adapter and found these.
Although this is by no me known brand, there is no quality problems. The connectors are gold-plated, there is no (not visible to me at least) image quality losses and also the tone, which is transmitted via HDMI, has no (audible for me) quality losses.
The only drawback is that it enables an output is covered in my television, but in this respect is only the television deduct a point. But since I do not need the output, arises for me is not a disadvantage.
Absolute buy recommendation for anyone who needs an angle adapter!
But beware, there is the adapter to the left or to the right angled!