one other concern not mentioned by others, vibration. this can come from being too close to a door or being mounted on something with moving parts, ceiling fans and garage door openers.
Also tulip like lamp shades where the base is at the top can concentrate heat and wear the electronics down; canister mounts do the same if no venting.
Also tulip like lamp shades where the base is at the top can concentrate heat and wear the electronics down; canister mounts do the same if no venting.