Put the unit on the floor - it has nowhere to fall. I have had so much success with my machine that I can't go to sleep without it.I have Resmed as well, set at 15 and the lag time before I go to sleep is only 10 minutes now, whereas before using it, I was lucky to get 2 hours sleep all night and stopped breathing 130 times a night according to the clinic. I haven't had apnoea since using it.
If you persevere, you will certainly reap the benefits.All the best.