Quoted from PennSkier:
I just leave them stuck in the coin door in the locked position -
Did this until my son nearly split his forehead open on one.
Quoted from Rick432:
Not my idea, but read it here on the forums.
I use the 3M Command strips that have the small hooks attached. I mount them behind the right front leg. Not visible. Easily accessible. Reversible.
Now this. Much less dangerous with toddling folk in the house. Not to mention he has "runnoft" with them a couple of times. That was fun...