I've had one for 6 yrs ---
Make a tube for the tubing out of fleece. Cover it, and either tape it on or use some velcro to make it stay put. That keeps it from making noise on my headboard.
Set the unit on the floor --- BEST place for it! :) If you don't want it directly on the floor then set a couple of hardback books on the floor and set it on that. i have a humidifier in mine. If it sits on the bedside table I will drown...the moisture builds up and comes back on me.
I also have a "water pillow" that I got from a physical therapist. You can get it on amazon (at least the last time I checked you could). It actually allows the headpiece to squish down in and doesn't make for problems for me like a hard pillow does. Also, I sleep on my stomach with the CPAP!!!
Check out www.cpaptalk.com