-When you deploy a scale set, you also have the option to deploy with a single [placement group](./virtual-machine-scale-sets-placement-groups.md) per Availability Zone, or with multiple per zone. For regional (non-zonal) scale sets, the choice is to have a single placement group in the region or to have multiple in the region. If a scale set property called `singlePlacementGroup` is set to false, the scale set can be composed of multiple placement groups and has a range of 0-1,000 VMs. When set to the default value of true, a scale set is composed of a single placement group, and has a range of 0-100 VMs. For most workloads, we recommend multiple placement groups, which allows for greater scale. In API version *2017-12-01*, scale sets default to multiple placement groups for single-zone and cross-zone scale sets, but they default to single placement group for regional (non-zonal) scale sets.
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