There is little to argue against a 12 gauge shotgun as a home defense solution. Rather than equipping yourself with a pistol grip shotgun, in order to reduce the length for indoors, enter the Kushnapup conversion for your SAIGA-12.
The Kushnapup conversion was designed primarily to work with the 12 gauge version of the Russian made Izhmash SAIGA series of AK’s. However, they were tested to work with the other shotguns and rifles in the SAIGA Kalashnikov series.
Cherry Bomb with Izhmash SAIGA-12 with Kushnapup bullpup conversion
The model above currently has no functioning sights. Ultimak makes a gas tube mounted rail, for $100, but requires a gunsmith to drill and tap it into place. The Kushnapup conversion cost is $275 and is currently shipping.