Help please. Which sub for Genelec 8361a

Hello lovely people.

Im looking to extend my system further and I dont know which subwoofer pairing is better for (a pair of) 8361a’s?

2x7370a or a single 7380a? the w371 is on my wishlist but not in the budget unfortunately..

How important is to match subs spl with mains?even if i dont ever reach their max spl capabilities? And if i want to use the 7370 as an extension of both mains (not summed in mono) they wont add up in spl- will they lack in that scenario? what are the benefits of that setup vs 2 subs summed to mono and which is better? (vs single 7380 aswell).

Lastly will the double subwoofer reduce LF decay time?

Grateful for as much info you can provide.

Thank you!!!