So these are my supports, I want to upgrade them to Moonlight 4P.
Their stat requirements.
Lucia 22 000 HP 40% ER(slot6 probably HP)
Yuzuha 3000 ATK 171% AM(slot6 needs to be AM)
Astra 2963 ATK 100% ER(slot6 needs to be ER)
Soukaku 2500 ATK 100% ER(slot6 needs to be ER)
Lucy 1923 ATK 100% ER(slot6 needs to be ER)
Rina 70% Pen Ratio 80%ER(2p needs to be Puffer)

Supports have high base ER, so I want to take advantage of this by using ER on slot 6 on most of them, exept for Yuzuha and Lucia.

Now I can think about Moonlight 4P allocation.
If I roll Moonlight disc with HP% and flat HP, I should save them for Lucia.
If I roll Moonlight disc with ATK% and flat ATK, I should save them for Yuzuha, Astra, Soukaku, and last priority Lucy since her stat requirement is low.
If I roll Moonlight disc with AP, I should save them for Yuzuha, (ideally they contain ATK%, Flat ATK, and AP)
If I roll Moonlight disc with a lot of crits, I can save them for Rina, and perhaps Lucy if she has enough ATK.