Can I fix my Separett incinerating toilet to the floor?

No. The toilet (both the BASIC and FAMILY) will need to be pulled forward off the ventilation pipe for regular maintenance (cleaning the vent pipe outlet on the rear of the toilet). In addition, if the toilet is not going to be used for a period of time, it should only be switched off (ie the fan stops) if it’s pulled forward from the vent pipe. Otherwise, condensation can settle inside the toilet.