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You need to account for opportunities. The opportunities are affected by runners reaching 1B, by groundball rate, and strikeout rate. If you have player on 1B with 1 out and there is a strikeout, then you really did not fail at turning a double play because there was no opportunity.
For Jose Altuve in 2019 when you account for these things he was expected to turn 52 double plays and he actually turned 49 double plays, so he was -3 for double plays. You could also say he was 49/52 = 0.942, which is about 5.8% fewer double plays than average.
For Yolmer Sanchez, he had 108 double plays, but he was only expected to have 93, so he was 15 double plays above average. This is 108/93 = 1.16, so he was 16% better than average.
For Eric Sogard he had 28 double plays and was expected to have 28 double plays.
The best in 2019 was Kolten Wong with +18 double plays and the worst was Adam Frazier with -11 double plays for the season. That difference of 29 double plays between the best and worst is about 7 defensive runs for the season.
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