Turkey seems to be very hit or miss. There are a lot of predatorial turkish marketing companies for LL such as wannabetaller. Several patients have had bad experiences with wannabetaller, so you might want to avoid them if you can. It is better to find an individual doctor with a good reputation and history. For example, Dr. Halil Buldu in Istanbul. I am currently doing lengthening with him (LON Femurs). Currently at around 8cm going for 8.5-9cm. He is very skilled and kind, you can check him out if you'd like.
In my mind I am thinking 10cm could be possible, but not without a quite considerable risk. The only reason i am continuing after hitting 8cm is because I feel really good and i have some more time here in Istanbul. However, if I were to sense something was wrong at this point, I would immediately stop lengthening.
My starting height was 177 in the evening, around 179-180 in the morning and I haven't experienced any problems during lengthening. Dr. Halil has a good team and he really cares about his patients. This is my experience with him atleast.
Also, don't let people tell you that you can't have LL because you are a certain height, it's your body, money, and time.