Clear Activation Lock on Unmanaged Apple Business Manager Devices

Hi,

We have our devices listed in Apple Business Manager but they are not enrolled in MDM. Some of the devices are locked in Activation Lock screen as employees logged in with their personal account .

1. Since devices are company owned and already available in ABM is there any way to remove activation lock easily without providing proof of purchase to apple?
2. In order to prevent devices getting into activation lock in future the only way is to Enroll the device in a MDM?
3. Are there anyways to bypass activation lock if we are not using MDM