1 source checked for this shloka
सः he, पूर्वस्यांद्वारि at the eastern gate, प्रहस्तम् Prahastha, राक्षसम् Rakshasa, व्यादिदेश posted, दक्षिणस्याम् at the southern gate, महावीर्यौदि of great prowess, महापर्श्वा Mahaparsva महोदरौ Mahodara, व्यादिदेश posted, अथ and, तदा like that, पश्चिमायांद्वारि at the western gate, महामायाम् Mahamaya, बहुभिः many, राक्षसैः Rakshasas, वृतम् surrounded by, पुत्रम् son, इन्द्रजितम् Indrajith, व्यादिदेश assigned duty.
Ravana posted Prahastha surrounded by many Rakshasas at the east gate, and the Rakshasas of great prowess, Mahaparsva and Mahodara at the southern gate, and like that Mahamaya and Indrajith, his own son at the western gate.