Will sonapad is sufficient for sound proofing

Sonopan is a good sound-damping layer and can noticeably reduce noise, but by itself it isn’t considered full soundproofing. If the goal is meaningful sound isolation—like reducing voices or TV noise—it works best as part of a layered wall system with insulation and additional drywall. We can tailor the assembly depending on how much sound reduction you’re looking for.

It depends on the STC rating you are after. There are a lot of other assembly that can change the STC rating. One of the beneficial assembly that helps STC is adding metal resilent channel (reasonable cost) or doubling up the gypsum board but will result in higher cost. You can also look into the batt insulation rating as well as some are more dense and provide better sound control.

If you want to use it alone its better to put on walls but because people are walking, moving chairs right on the ceiling the noise will travel faster and you need to fill the joists with rockwool, then run Baileys channels 2'o/c then sonopanels and 2 layers of type X gypsum and that should exceed the 57 STC for the sound proofing