The tap on the bum is very unlikely to work at this age (or any IMO) and you will face troubles when trying to teach her not to hit... Also it's important for when she's older that she learns to respect your words because if she only doesn't touch them in case you smack her, if you aren't there she won't be afraid of the smack and thus might well go ahead and touch, and thus unless you're actually physically there she won't be safe, kwim?

Honestly, at 12 months your only real option is prevention. A fire-guard in front? Moving the unit in some way that she can't reach? Kids can be relied upon not to touch things once they have impulse control, and most FOUR year olds still struggle with that! You can try making a noise rather than saying no, to get her attention, but you need to follow up by moving her away IMMEDIATELY and even that might not work. I use an escalating "a-a-a-a-a-a-a-A-A-A-A-A-A-A!" when DD is touching or doing something she oughtn't. It stops her *just* long enough for me to get there and grab her and move her to safety.

Until she's old enough to both understand that she mustn't touch and be able to control her urges to, anything she could break or harm herself on needs to be baby-proofed. Sorry hun, not really what you wanted to read i'm sure...

Bx