7 is not safe for anyone who has ever had gout. You are almost certain to end in a state where uric acid crystals dissolve and reform, sending continuous signals to your immune system. White blood cells attack crystals in both these states, and it is difficult to tell from the pain. Attacks during crystals dissolving tend to be more widespread, but this is not always the case.
The target for most gout sufferers is 5 mg/dL (0.30 mmol/L).
This might need to be relaxed to 6 if kidney problems or other health issues prevent attaining 5, but 5 gives the best safety margin for fluctuations in uric acid level, and in temperature.
It is always a good idea for the first six months to try to get down to 2 or 3. This dissolves existing crystals faster. Which reduces the period of time you are at risk from gout flares.