AWS SDK for .NET Documentation
PlacementGroup Property
AmazonAmazon.AutoScaling.ModelUpdateAutoScalingGroupRequestPlacementGroup Did this page help you?   Yes   No    Tell us about it...
The name of the cluster placement group, if applicable. For more information, go to Using Cluster Instances in the Amazon EC2 User Guide.

Constraints:

Length
1 - 255
Pattern
[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Declaration Syntax
C#
public string PlacementGroup { get; set; }

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)