I would not do deck blocks…I would do a 24”x24x18” footing with a Simpson post base….and a couple of #4 bars horiz. And a bent one going from horiz to vert in center … I would also do a sono tube -8” above grade , burying posts is a bad idea even if ptdf…I build in Ca so frost not an issue, wood has no business sub grade, and deck blocks unless set in a footing are shit. I have built many decks this way, no issues.