By Jennifer Piacenti The Washington Commanders (4-5) head to Philadelphia to face the undefeated Eagles (8-0) in an NFC East showdown on Monday Night Football. The Eagles remain the only undefeated team in the NFL and will be looking to continue their perfect start while the Commanders will be the visiting road dogs looking to pull off an upset. The Commanders had won three in a row before losing at home to the Vikings last week. Here is where the market stands at SI Sportsbook, with the Eagles heavily favored at home. • Moneyline: Commanders (+410) | Eagles (-549)• Spread: Commanders +10.5 (-…