When you leave your canister, just try and put it somewhere it won’t easily roll away like a small dip in the ground or where it has rocks or bushes around it. Avoid obvious bad spots where it would roll a long distance if it is knocked over or next to water (they aren’t watertight).
You will probably find that the can won’t be messed with. Most bears are clever enough to recognise the canister and won’t waste energy trying to get in. That doesn’t mean that they will not have a quick look or that a young or really hungry bear won’t make a little effort to get in. If you here them at your can, just leave them and they will soon realise there is no easy food and move on.
One non-bear related tip for canisters (garcia can, maybe the others too) is to leave them upside down. The garcia can is not watertight so any overnight rain can seep in if the lid is left facing up. Thankfully, I learnt that one from someone else’s misfortune.
Phil B