Most standard ceiling heights are high enough for normal use of the bellicon. The general rule of thumb is that your ceilings need to be around 50cm taller than the user in order to use the bellicon safely.
If this is not possible for you in your home, we do have shorter legs available for purchase. They are 10cm shorter than normal. However, due to the shorter length, sometimes users need a stronger bungee than normal, so they don't touch the floor while bouncing. Shorter legs are only available upon request at firstname.lastname@example.org