Toddler wandering

My daughter is 21 months and I'm thinking of transitioning her to a toddler bed or Montessori floor bed. However, my biggest concern is that she'll wake up in the middle of the night and wander around before I wake up. Granted, I'm a super light sleeper but im still paranoid she'll get hurt in some way. I guess I'm asking what most ppl do when their kids reach this stage? Do u just baby proof everything and hope for the best? Maybe lock her door from the outside? TIA