Hello Alexk345
Welcome to Microsoft Q&A Platform, thanks for posting your query here.
Azure Marketplace offers a wide range of images from different publishers, including Plesk, but it may not have the exact image you are looking for.
However, you can still create a custom image with the software stack you need and use it to create a virtual machine in Azure.
To create a custom image, you can start with a base image from the Azure Marketplace that is closest to your requirements and then install the additional software and configurations you need. Once you have the image ready, you can capture it and use it to create virtual machines in Azure.
Ref: https://learn.microsoft.com/en-us/partner-center/marketplace/azure-vm-use-approved-base
Once you have the managed image, you can use it to create virtual machines in Azure.
Ref: https://learn.microsoft.com/en-us/partner-center/marketplace/azure-vm-use-own-image
You are correct that Azure Marketplace offers images from various publishers, including some that may not be well-known. However, Microsoft has a process in place to ensure that the images in the Azure Marketplace are secure and meet certain quality standards. hat being said, it is always a good practice to review the publisher's reputation and the image's reviews before deploying it. You can also use third-party security tools to scan the image for malware or other security threats before deploying it.
Hope this helps.