Yes this is perfectly fine.

A daily maintenance level of creatine is 10g per day. Take two 5g servings, one in the morning and one in the evening.

You can load up on creatine without training that week if you choose but you may not get the same creatine retention you would get if you were training during the loading phase. No studies have been done to see the difference in training vs non-training during a loading phase.

Studies have shown the best way to get the most from creatine is to take 20g for the first 5 days of use and then maintain 10g per day everyday after.

Adequate amount of creatine for a daily maintenance level is two 5g servings.

On training days take one 5g serving around 60minutes before your workout and 5g immediately after.

Creatine uptake into muscles is probably the same whether you take it before or after training but no one knows for sure because studies have not been done on this. So best having it after (as your pre-workout products contain a small amount of creatine also).

There is no good research or evidence that shows you need to come off Creatine at all. Extensive scientific studies and expert safety reviews have been conducted to this effect.

Some people like to go for 6-8 weeks and then have a week off but as stated above there is no study to show this.

PHD do not give a usage period.

None of the thousands of scientific studies or expert roundtable safety reviews on creatine has shown any negative side effects. Even the "reports" of cramps, bloating, etc are not supported by any proper research.

The only proven side effects of creatine are inceased muscle size and strength and improved high-intensity exercise performance

The only caution would be for people who have kidney problems or a family history of kidney problems for whom creatine may not be a good idea.

You can add it to shakes or take it just before a meal.

If you train hard regularly, you use up a lot of energy from your body's glycogen stores, which are made up of sugar. So for this and other reasons, well-timed sugar or high-GI carb intake is not going to be unhealthy. If taken with protein and creatine, these carbs will dramatically increase the amount of creatine and protein that is delivered to and stored in the muscle, thus improving recovery and increasing strength and muscle gains. This is one of the reasons why Cell-Tech is the best-selling creatine formula ever - lots of carbs and patented ingredients that ensure maximum creatine retention. Protein and creatine are certainly not unhealthy however, certain types of carbs can be if they are taken in excess too long before or after workouts. The bottom line is correctly-timed carbs WILL improve your results. A good amount to take with creatine and protein after training is at least 60 grams if you are training hard.
For the full story, see - http://www.tropicanafitness.com/view/v/article/a/176 to get the facts about creatine.

Each serving of Synergy contains a half day's dose of creatine. So I would skip the creatine and take two servings of synergy per day. Plus Synergy also has carbs, so it would help you retain more creatine in the muscle (although more would be better to increase creatine retention further)