Paul, I can't see any picture or attachment but if your tripod has a standard 1/4" screw it will be fine and perfectly safe to just use the tripod mounting socket on the base of the camera body.
The Canon mounts are quite sturdy and you can hang plenty of weight off them without too much risk.
It's only when lenses start getting quite long that you need a tripod collar. The 100mm macro is fine without one.
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