Whether to recite Srimad Ramayanam, Srimad Bhagavatam during alankara asanam or paryanka asanam, is done as per one’s convenience.
In alankara asanam, after offering dhoopam and deepam to Perumal, there is a part where slokas can be recited. Or in Paryanka asanam, after kapoora harathi, a period for sloka recitation is available. Either of these periods is used for reciting Ramayana and Bhavatam slokas, based on one’s convenience.
Slokas can also be recited after offering parasadam to Perumal during Paryanka asanam.
It is not a must for Bhagavatam moolam parayanam after Tiruvaradhanam.
Notes:
Not sure what is the basis for this query – Bhagavatam moolam parayanam can be done after Tiruvaradhanam.