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Brendan, having twelve M16 rods chemically bonded is ample and should give you a rock-solid platform - roadside bollards don't have this! However, I think the hardest part for you now is drilling the holes where you want in the concrete. Drill bits tend to wander as soon as they hit aggregate and this can easily put you off 5mm if you're not careful. It should be OK if you drill into the concrete using the holes of the pier as a guide (i.e., the pier is in position while you drill). Ideal case would be to use a diamond core bit if you can get hands on one.
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