Place For EtikaaF
When you say sunnah Eiktikaf it is held only in the mosque. The prophet’s actions before the prophethood are not Hujjah. However, if one likes to sit in isolation or meditation, one may do that but that is not a sunnah aiktikaf. The prophet never did it outside the mosque. His wives did not do that in their houses adjacent to the mosque. They had to come to the mosques for Etikaf.