Assalamualaikum wa rahmatullah, may Allah bless you dear Ustadh. Can we "mix" the quantities of dhikr in salah. For example 2 times Subhana Rabbi al-A'la in one sujood and 3 times in the second? Or does it have to be the same number. Jazakallah kheir

Ustadh AbdulAziz al-Haqqan

Yes, you can. That's not a problem, insha'Allah.