The bets are determined by checking a wide variety of projections against my own knowledge of how players will be utilized given game context. The player prop lines were taken from this site.
When analyzing projections from fantasy sites, you'll often find that the projections are higher than betting lines, which will make you bet shit tons of overs. This is a common mistake. The projections are mean based, which tend to skew higher because the range of outcomes are not evenly distributed. (i.e., a running back on a good day could go for over 100 yards, but he would never go under 0... hopefully). If you find a mean projection lower than the Vegas line, the under is likely a good bet. To bet an over, the mean projection should be significantly higher. All bets below will follow that logic.
Sunday Morning Slate
Ryan Tannehill o205.5 passing yards -114 (FanDuel)
Sunday 1PM Slate
Trevor Lawrence u256.5 passing yards -115 (BetMGM)
Derek Carr o1.5 passing TDs +165 (Bet365)
Jerome Ford o35.5 rushing yards -114 (FanDuel)
Brandon Aiyuk o47.5 receiving yards -110 (Bet365)
Ja'Marr Chase o86.5 receiving yards -110 (Bet365)
Josh Downs u3.5 receptions +140 (DraftKings)
Sunday 4PM Slate
Mac Jones o204.5 passing yards -110 (Bet365)
Matt Stafford u280.5 passing yards (Bet365)
AJ Brown o5.5 receptions +120 (DraftKings)