Off the top of my head. Handbrake off, petrol thank full, if on wheels tyres need more psi to avoid flat spots, if off ground jack stands and as you said support control arms. Put it on cardboard to prevent damp rising. If concerned about rust clean and seal or even wd40 on non painted pits or some of that aquaphobic stuff? Remove battery, use some rock salt in a bowl to keep damp inside at bay. Would also suggest a good service before she is parked up.