Houston is 62-30 in its last 92 games. The Angels are 19-43 during their past 62 games. 
The Astros are much superior. More so since the Angels will be without underrated injured shortstop Andrelton Simmons and possibly superstar Mike Trout for another game. Trout didn't play on Saturday after his wife gave birth. He might not play today either since the Angels are idle on Monday. 
Houston has beaten LA 20 of the last 28 times on the road. 
So why such a low line? Is it because the Angels hold a starting pitching edge? No, I can't say that in a pitching matchup of Josh James versus Shohei Ohtani. James can get wild, but he is a big strikeout pitcher with a 2.57 career ERA versus the Angels in 10 appearances. He has a high upside. 
The Angels lose Ohtani's bat at the DH spot because he'll be on the mound. Ohtani is on the comeback trail. He looked terrible in his first start, which came last Sunday against the A's. Ohtani faced six batters. He gave up three hits and three walks. His career ERA in two starts against the powerful Astros is 7.04.